### Minimal Containerfile for AlmaLinux 9

Source: https://github.com/almalinux/container-images/blob/main/README.md

An example Containerfile for building a minimal container image for AlmaLinux release 9. It uses dnf to install packages into a root filesystem and then copies it to a scratch image.

```Dockerfile
ARG SYSBASE=almalinux:9
FROM ${SYSBASE} as system-build

RUN mkdir /mnt/sys-root; \
    dnf install -y \
    --installroot /mnt/sys-root \
    --releasever 9 \
    --setopt install_weak_deps=false \
    --nodocs \
    almalinux-release \
    bash \

...

FROM scratch
COPY --from=system-build /mnt/sys-root/ /

CMD ["/bin/bash"]
```

--------------------------------

### Minimal Dockerfile for AlmaLinux 9 amd64

Source: https://github.com/almalinux/container-images/blob/main/README.md

A Dockerfile example for building a minimal container image for AlmaLinux release 9 on the amd64 platform, intended for the Docker Official Library. It starts from a scratch image and adds a pre-compressed tarball.

```Dockerfile
# Tags: minimal, 9-minimal, 9.3-minimal, 9.3-minimal-20231124
FROM scratch
ADD almalinux-9-minimal-amd64.tar.xz /

CMD ["/bin/bash"]
```

--------------------------------

### Build AlmaLinux 8 Minimal Images

Source: https://github.com/almalinux/container-images/blob/main/README.md

Builds container images using docker/build-push-action. This example specifies platforms, disables provenance, loads images locally, and includes tags generated by metadata-action. It targets AlmaLinux 8 minimal images.

```sh
/usr/bin/docker buildx build --file ./Containerfile.minimal ... \
 --platform linux/386,linux/amd64,linux/ppc64le,linux/s390x,linux/arm64 \
 --provenance false ... \
 --tag docker.io/***/8-minimal:latest --tag docker.io/***/8-minimal:8 --tag docker.io/***/8-minimal:8.9 --tag docker.io/***/8-minimal:8.9-20240319 --tag quay.io/***/8-minimal:latest --tag quay.io/***/8-minimal:8 --tag quay.io/***/8-minimal:8.9 --tag quay.io/***/8-minimal:8.9-20240319 \
 --load \
 --metadata-file /home/runner/work/_temp/docker-actions-toolkit-*/metadata-file \
 https://github.com/***/container-images.git#270a6d3fd433cfa6c3e1fff5896a92d1ae2896be:Containerfiles/8
```

--------------------------------

### Get Package Architecture

Source: https://github.com/almalinux/container-images/blob/main/README.md

Use this command to determine the package architecture. For the 'micro' image, 'uname -m' is used instead.

```bash
rpm -qf --queryformat '%{ARCH}' /etc/almalinux-release
```

--------------------------------

### Generate Image Tags and Metadata

Source: https://github.com/almalinux/container-images/blob/main/README.md

Uses docker/metadata-action to generate tags, labels, and annotations for container images. Example shows tags for AlmaLinux 8 minimal image.

```json
"tags": [
          "docker.io/***/8-minimal:latest",
          "docker.io/***/8-minimal:8",
          "docker.io/***/8-minimal:8.9",
          "docker.io/***/8-minimal:8.9-20240319",
          "quay.io/***/8-minimal:latest",
          "quay.io/***/8-minimal:8",
          "quay.io/***/8-minimal:8.9",
          "quay.io/***/8-minimal:8.9-20240319"
        ]
```

--------------------------------

### Build, Test, and Push Workflow

Source: https://github.com/almalinux/container-images/blob/main/README.md

This GitHub Actions workflow is used to build, test, and push container images to the Client Library. It is triggered manually via workflow_dispatch and accepts a boolean input for production pushes.

```yaml
name: Build, test and push to the Client Library

on:
  workflow_dispatch:
      inputs:
        production:
          description: |
            'Push to production registries'
            'not checked - to testing'
          required: true
          type: boolean
          default: true
...
```

--------------------------------

### AlmaLinux 9.5 Micro Image Details

Source: https://github.com/almalinux/container-images/blob/main/README.md

Provides details about the AlmaLinux 9.5 micro image, including its build version and available tags.

```text
AlmaLinux OS 9.5
Container Image, build `20250411091645`, generated by the [GitHub Action](https://github.com/AlmaLinux/container-images/actions/runs/14399603789)

Platforms:

```
linux/386, linux/amd64, linux/ppc64le, linux/s390x, linux/arm64
```

:almalinux: micro

```
quay.io/almalinuxorg/9-micro:latest
quay.io/almalinuxorg/9-micro:9
quay.io/almalinuxorg/9-micro:9.5
quay.io/almalinuxorg/9-micro:9.5-20250411
```
```

--------------------------------

### Configure Platforms in GitHub Actions Workflow

Source: https://github.com/almalinux/container-images/blob/main/README.md

Define the target platforms for building container images in the build-test-push.yml workflow file. Separate platforms with commas.

```yaml
platforms: 'linux/amd64, linux/ppc64le, linux/s390x, linux/arm64'
```

--------------------------------

### Configure Image Types for Build Matrix (Workflow Dispatch)

Source: https://github.com/almalinux/container-images/blob/main/README.md

Set the image types matrix for the build when using workflow dispatch in the build-test-push.yml file.

```bash
workflow_dispatch)
  ... 
  echo "image_types_matrix=$(jq -c <<< '[${{ format('"{0}"', ( inputs.type_default && '<type_name>' ) ) }}]')
```

--------------------------------

### Configure Registries in GitHub Actions Workflow

Source: https://github.com/almalinux/container-images/blob/main/README.md

Specify production and testing registries in the build-test-push.yml workflow file. Replace `<user_name>` with your actual username for each registry.

```yaml
registries_production: 'docker.io/<user_name>, quay.io/<user_name>, ghcr.io/<user_name>'
registries_testing: 'docker.io/<user_name>, quay.io/<user_name>, ghcr.io/<user_name>'
```

--------------------------------

### Checkout Container Images Repository

Source: https://github.com/almalinux/container-images/blob/main/README.md

Checks out the 'main' branch of the container-images repository using the actions/checkout@v6 action. Only the latest commit is fetched.

```sh
actions/checkout@v6
```

--------------------------------

### Verify Containerd Image Store Activation

Source: https://github.com/almalinux/container-images/blob/main/README.md

Confirms that the containerd image store has been successfully enabled by checking the Docker info output.

```text
[[driver-type io.containerd.snapshotter.v1]]
```

--------------------------------

### Checkout Container Images Repository

Source: https://github.com/almalinux/container-images/blob/main/README.md

Checks out the container-images repository for a specific branch with fetch-depth set to 0.

```yaml
      - name: Checkout almalinux/container-images, branch '${version_major}', path '${version_major}'
        uses: actions/checkout@v6
        with:
          repository: almalinux/container-images
          ref: '${version_major}'
          path: '${version_major}'
          fetch-depth: 0
```

--------------------------------

### Test Container Image

Source: https://github.com/almalinux/container-images/blob/main/README.md

Tests a container image by running a command inside it to verify the release string and architecture. The output is piped to grep for validation.

```sh
docker run --platform=${platform} ${digest} /bin/bash -c " \
 echo \"\\\$(cat /etc/almalinux-release) \
$(${arch_query})\"" | \
grep -E "${release_string}.*${expected_arch}"
```

--------------------------------

### Configure Image Types for Scheduled Workflow

Source: https://github.com/almalinux/container-images/blob/main/README.md

Define the list of image types for the build in the build-test-push.yml file for scheduled workflows. Separate types with commas and enclose each in double quotes.

```yaml
env:
  ...
  image_types: '"<type_name>", "<type_name>"'
```

--------------------------------

### Configure Containerd Image Store for Docker

Source: https://github.com/almalinux/container-images/blob/main/README.md

Enables the containerd image store by modifying the Docker daemon configuration. The Docker service must be restarted for the changes to take effect.

```json
{
    "features":
    {
        "containerd-snapshotter": true
    }
}
```

--------------------------------

### Set AlmaLinux Versions List for Scheduled Workflows

Source: https://github.com/almalinux/container-images/blob/main/README.md

Specify the AlmaLinux versions to be processed by scheduled workflows. Versions should be comma-separated and enclosed in double quotes.

```yaml
env:
  ...
  versions_list: '"8", "9", "<version_latest>"'
```

--------------------------------

### Define AlmaLinux Major Version Input

Source: https://github.com/almalinux/container-images/blob/main/README.md

Configure the major AlmaLinux version as a choice input for workflow dispatch. Ensure the default is set to the latest available version.

```yaml
version_major:
          description: 'AlmaLinux major version'
          required: true
          default: '<version_latest>'
          type: choice
          options:
            - <version_latest>
            - 9
            - 8
```

--------------------------------

### Docker Library Definition Template

Source: https://github.com/almalinux/container-images/blob/main/README.md

A template file used to generate the Definition file for the Docker Official Library. It uses Go templating to dynamically set tags, Git references, and directory paths for different architectures.

```yaml
Tags: {{ .tags }}
GitFetch: refs/heads/{{ .version_major }}
GitCommit: {{ .commit_hash }}
amd64-Directory: {{ .image_type }}/amd64/
arm64v8-Directory: {{ .image_type }}/arm64/
ppc64le-Directory: {{ .image_type }}/ppc64le/
s390x-Directory: {{ .image_type }}/s390x/
Architectures: amd64, arm64v8, ppc64le, s390x
```

--------------------------------

### Set AlmaLinux Minor Version Based on Major Version

Source: https://github.com/almalinux/container-images/blob/main/README.md

Dynamically set the AlmaLinux minor version based on the selected major version input. Use placeholders for specific minor versions.

```sh
case ${{ inputs.version_major }} in
            8)
              version_minor="<8_minor>" ;;
            9)
              version_minor="<9_minor>"  ;;
            10)
              version_minor="<10_minor>" ;;


```

--------------------------------

### Add and Commit Changes

Source: https://github.com/almalinux/container-images/blob/main/README.md

Commits and pushes changes to the repository, rewriting history and setting the upstream branch.

```yaml
      - name: Commit and push almalinux/container-images, branch '${version_major}'
        uses: EndBug/add-and-commit@v10
        with:
          force: true
          branch: '${version_major}'
          set_upstream: true
```

--------------------------------

### Set Latest AlmaLinux Version Variable

Source: https://github.com/almalinux/container-images/blob/main/README.md

Define the latest AlmaLinux major version to be used as a placeholder or default.

```yaml
version_latest: <version_latest>
```

--------------------------------

### Dockerfile for RootFS Extraction

Source: https://github.com/almalinux/container-images/blob/main/README.md

This Dockerfile is used to build an image from extracted RootFS blobs. It's part of the process to prepare the root file system for new container images.

```Dockerfile
FROM scratch
ADD rootfs.tar.gz /
CMD ["/bin/bash"]
```

--------------------------------

### Configure Image Types for Workflow Dispatch

Source: https://github.com/almalinux/container-images/blob/main/README.md

Add or modify inputs for specific image types when triggering the workflow dispatch in the build-test-push.yml file.

```yaml
type_<type_name>:
  description: '<type_name>'
  required: true
  type: boolean
```

--------------------------------

### Publish to Docker Official Library Workflow

Source: https://github.com/almalinux/container-images/blob/main/README.md

This GitHub Actions workflow is responsible for publishing container images to the Docker Official Library. It is triggered manually and requires a boolean input to confirm the publication.

```yaml
name: Publish images to the Docker Library

on:
  workflow_dispatch:
      inputs:
        pr:
          description: 'Publish to Docker Official Library'
          required: true
          type: boolean
          default: true
...
```

--------------------------------

### Update Dockerfile for Official Library Build

Source: https://github.com/almalinux/container-images/blob/main/README.md

This Dockerfile snippet shows how to update the date stamp in a Dockerfile for official library builds. It ensures that Docker uses the latest pushed container image.

```dockerfile
# Tags: 8-minimal, 8.9-minimal, 8.9-minimal-20240319
FROM scratch
ADD almalinux-9-minimal-amd64.tar.xz /

CMD ["/bin/bash"]
```

--------------------------------

### Set Scheduled Workflow Cron Time

Source: https://github.com/almalinux/container-images/blob/main/README.md

Configure the schedule for the workflow to run at a specific time daily using Unix cron format. The default is 04:00 UTC.

```yaml
schedule:
    # run every day at 04:00 UTC
    - cron:  '00 04 * * *'
```

--------------------------------

### Check for Important DNF Updates

Source: https://github.com/almalinux/container-images/blob/main/README.md

Checks for important security updates using dnf. The exit code determines if the build process should continue, especially for scheduled workflows. This command runs within a podman container.

```sh
dnf check-update --secseverity=Important
```

--------------------------------

### Commit Message for Dockerfile and RootFS Changes

Source: https://github.com/almalinux/container-images/blob/main/README.md

This is the commit message format used when pushing updated Dockerfiles and RootFS to the repository. It includes version, image type, build date, and a link to the GitHub Action run.

```yaml
AlmaLinux ${version_major}-${images_type} image build as of ${date_stamp} (with ${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}).
```

=== COMPLETE CONTENT === This response contains all available snippets from this library. No additional content exists. Do not make further requests.