build.yml

---
name: build-centos-image
on:
  pull_request:
    branches:
      - main
  schedule:
    - cron: '05 10 * * *'  # 10:05am UTC everyday
  push:
    branches:
      - main
    paths-ignore:
      - '**/README.md'
  workflow_dispatch:

env:
  IMAGE_DESC: "CentOS Stream-based images"
  IMAGE_REGISTRY: "ghcr.io/${{ github.repository_owner }}"

concurrency:
  group: ${{ github.workflow }}-${{ github.ref || github.run_id }}-${{ inputs.brand_name}}-${{ inputs.stream_name }}
  cancel-in-progress: true

jobs:
  build_push:
    name: Build and push image
    runs-on: ubuntu-24.04

    permissions:
      contents: read
      packages: write
      id-token: write

    steps:
      # Checkout push-to-registry action GitHub repository
      - name: Checkout Push to Registry action
        uses: actions/checkout@v4

      - name: Install Just
        shell: bash
        run: |
          set -eoux pipefail
          JUST_VERSION=$(curl -L https://api.github.com/repos/casey/just/releases/latest | jq -r '.tag_name')
          curl -sSLO https://github.com/casey/just/releases/download/${JUST_VERSION}/just-${JUST_VERSION}-x86_64-unknown-linux-musl.tar.gz
          tar -zxvf just-${JUST_VERSION}-x86_64-unknown-linux-musl.tar.gz -C /tmp just
          sudo mv /tmp/just /usr/local/bin/just
          rm -f just-${JUST_VERSION}-x86_64-unknown-linux-musl.tar.gz

      - name: Check Just Syntax
        shell: bash
        run: |
          just check

      - name: Image Name
        shell: bash
        run: |
          IMAGE_NAME="$(just image_name)"
          echo "IMAGE_NAME=${IMAGE_NAME}" >> $GITHUB_ENV

      - name: Default Tag
        shell: bash
        run: |
          DEFAULT_TAG="$(just generate-default-tag)"
          echo "Default Tag: ${DEFAULT_TAG}"
          echo "DEFAULT_TAG=${DEFAULT_TAG}" >> $GITHUB_ENV

      - name: Maximize build space
        uses: ublue-os/remove-unwanted-software@v7
        with:
          remove-codeql: true

      - name: Build Image
        id: build-image
        shell: bash
        run: |
          just build

      - name: Generate tags
        id: generate-tags
        shell: bash
        run: |
          alias_tags="$(just generate-build-tags \
                     "latest" \
                     "1" \
                     "$(podman inspect ${{ env.IMAGE_NAME }}:${{ env.DEFAULT_TAG }} | jq -r '.[].Config.Labels["org.opencontainers.image.version"]')" \
                     "${{ github.event_name }}" \
                     "${{ github.event.number }}")"

          echo "Tags for this Action..."
          echo "$alias_tags"
          echo "alias_tags=${alias_tags}" >> $GITHUB_OUTPUT

      # Tag Images
      - name: Tag Images
        shell: bash
        run: |
          set -eoux pipefail
          just tag-images "${{ env.IMAGE_NAME }}" \
                          "${{ env.DEFAULT_TAG }}" \
                          "${{ steps.generate-tags.outputs.alias_tags }}"

      # Workaround bug where capital letters in your GitHub username make it impossible to push to GHCR.
      # https://github.com/macbre/push-to-ghcr/issues/12
      - name: Lowercase Registry
        id: registry_case
        uses: ASzc/change-string-case-action@v6
        with:
          string: ${{ env.IMAGE_REGISTRY }}

      - name: Login to GitHub Container Registry
        uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Push to GHCR
        id: push
        if: github.event_name != 'pull_request'
        uses: Wandalen/wretry.action@ffdd254f4eaf1562b8a2c66aeaa37f1ff2231179 # v3.7.3
        with:
          attempt_limit: 3
          attempt_delay: 15000
          command: |
            set -euox pipefail

            for tag in ${{ steps.generate-tags.outputs.alias_tags }}; do
              podman push ${{ env.IMAGE_NAME }}:${tag} ${{ steps.registry_case.outputs.lowercase }}/${{ env.IMAGE_NAME }}:${tag}
            done

            digest=$(skopeo inspect docker://${{ steps.registry_case.outputs.lowercase }}/${{ env.IMAGE_NAME }}:${{ env.DEFAULT_TAG }} --format '{{.Digest}}')

            echo "digest=${digest}" >> $GITHUB_OUTPUT

      - name: Install Cosign
        uses: sigstore/cosign-installer@v3.7.0
        if: github.event_name != 'pull_request'

      - name: Sign container image
        if: github.event_name != 'pull_request'
        run: |
          cosign sign -y --key env://COSIGN_PRIVATE_KEY ${{ steps.registry_case.outputs.lowercase }}/${{ env.IMAGE_NAME }}@${TAGS}
        env:
          TAGS: ${{ steps.push.outputs.outputs && fromJSON(steps.push.outputs.outputs).digest }}
          COSIGN_EXPERIMENTAL: false
          COSIGN_PRIVATE_KEY: ${{ secrets.SIGNING_SECRET }}