release-image.yml

on:
  workflow_call:
    inputs:
      image:
        required: true
        type: string
      context:
        required: true
        type: string
      dockerfile:
        required: false
        type: string
        default: Dockerfile
    secrets:
      registry-password:
        required: true

permissions: read-all

jobs:
  build:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write
      id-token: write
    outputs:
      digest: ${{ steps.build-and-push.outputs.digest }}
      tags: ${{ steps.meta.outputs.tags }}
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Get image tag (from Dockerfile ARG VERSION)
        id: get_image_tag
        run: |
          if [[ "${{ github.event_name }}" == "push" && "${{ github.ref }}" == "refs/heads/main" ]]; then
           IMAGE_TAG=$(grep -m1 '^ARG VERSION=' "${{ inputs.context }}/${{ inputs.dockerfile }}" \
            | cut -d'=' -f2 | tr -d '"' | tr -d "'" | tr -d '[:space:]')
          else
            IMAGE_TAG=$(echo ${{ github.sha }} | cut -c1-7)
          fi
          echo "Using image tag: $IMAGE_TAG"
          echo "IMAGE_TAG=${IMAGE_TAG}" >> $GITHUB_ENV

      - name: Install cosign
        if: github.event_name != 'pull_request'
        uses: sigstore/cosign-installer@faadad0cce49287aee09b3a48701e75088a2c6ad
        with:
          cosign-release: "v2.5.3"

      - name: Setup Buildx
        uses: docker/setup-buildx-action@v3

      - name: Login to registry
        uses: docker/login-action@v4
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.registry-password }}

      - name: Extract Docker metadata
        id: meta
        uses: docker/metadata-action@v4
        with:
          images: ${{ inputs.image }}
          tags: |
            type=raw,value=${{ env.IMAGE_TAG }}
            type=raw,value=latest,enable=${{ github.ref == 'refs/heads/main' }}

      - name: Build and push
        id: build-and-push
        uses: docker/build-push-action@v6
        with:
          context: ${{ inputs.context }}
          file: ${{ inputs.context }}/${{ inputs.dockerfile }}
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          cache-from: type=gha
          cache-to: type=gha,mode=max

      - name: Sign published image (keyless / certificate-based)
        if: ${{ github.event_name != 'pull_request' }}
        env:
          COSIGN_EXPERIMENTAL: 1
          TAGS: ${{ steps.meta.outputs.tags }}
          DIGEST: ${{ steps.build-and-push.outputs.digest }}
        run: |
          echo "${TAGS}" | xargs -n1 -I {} cosign sign --yes {}@${DIGEST}

      - name: Verify signatures
        if: ${{ github.event_name != 'pull_request' }}
        env:
          COSIGN_EXPERIMENTAL: 1
          TAGS: ${{ steps.meta.outputs.tags }}
          DIGEST: ${{ steps.build-and-push.outputs.digest }}
        run: |
          echo "${TAGS}" | while read -r tag; do
            cosign verify \
              --certificate-identity="https://github.com/${{ github.repository }}/.github/workflows/release-image.yml@${{ github.ref }}" \
              --certificate-oidc-issuer="https://token.actions.githubusercontent.com" \
              "${tag}@${DIGEST}"
          done

      # - name: Sign the published Docker image
      #   if: ${{ github.event_name != 'pull_request' }}
      #   env:
      #     TAGS: ${{ steps.meta.outputs.tags }}
      #     DIGEST: ${{ steps.build-and-push.outputs.digest }}
      #   run: echo "${TAGS}" | xargs -I {} cosign sign --yes {}@${DIGEST}
      # - name: Verify ghcr image signatures
      #   if: ${{ github.event_name != 'pull_request' }}
      #   shell: bash
      #   env:
      #     COSIGN_EXPERIMENTAL: 1
      #     TAGS: ${{ steps.meta.outputs.tags }}
      #     DIGEST: ${{ steps.build-and-push.outputs.digest }}
      #   run: |
      #     echo "${TAGS}" | xargs -I {} cosign verify \
      #     --certificate-identity=https://github.com/${{ github.repository }}/.github/workflows/release-dogecoind.yml@${{ github.ref }} \
      #     --certificate-oidc-issuer=https://token.actions.githubusercontent.com \
      #     "{}@${DIGEST}"
  generate-provenance:
    needs: [build]
    if: ${{ github.event_name != 'pull_request' }}
    permissions:
      actions: read
      id-token: write
      packages: write
    uses: slsa-framework/slsa-github-generator/.github/workflows/generator_container_slsa3.yml@v2.1.0
    with:
      image: ${{ inputs.image }}
      digest: ${{ needs.build.outputs.digest }}
      registry-username: ${{ github.actor }}
    secrets:
      registry-password: ${{ secrets.registry-password }}