release-container.yml

name: Release Container

on:
  release:
    types: [published]
  workflow_dispatch:
    inputs:
      tag:
        description: "Manual tag to publish (e.g. v1.2.3). Leave blank to use the commit SHA only."
        required: false
        type: string

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

env:
  REGISTRY: ghcr.io
  IMAGE_NAME: ${{ github.repository }}

jobs:
  build-and-push:
    runs-on: ubuntu-latest
    timeout-minutes: 60
    steps:
      - name: Checkout
        uses: actions/checkout@v5

      - name: Set up QEMU
        uses: docker/setup-qemu-action@v4
        with:
          platforms: arm64

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v4

      - name: Log in to GHCR
        uses: docker/login-action@v4
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Extract image metadata
        id: meta
        uses: docker/metadata-action@v6
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
          tags: |
            type=semver,pattern={{version}}
            type=semver,pattern={{major}}.{{minor}}
            type=semver,pattern={{major}},enable=${{ !startsWith(github.event.release.tag_name, 'v0.') }}
            type=raw,value=latest,enable=${{ github.event_name == 'release' && !github.event.release.prerelease }}
            type=raw,value=${{ inputs.tag }},enable=${{ github.event_name == 'workflow_dispatch' && inputs.tag != '' }}
            type=sha,format=long
          labels: |
            org.opencontainers.image.title=SampleDB
            org.opencontainers.image.source=https://github.com/${{ github.repository }}
            org.opencontainers.image.licenses=MIT

      - name: Build and push (multi-arch)
        id: build
        uses: docker/build-push-action@v7
        with:
          build-args: |
            APP_BUILD_ID=${{ github.sha }}
          context: .
          file: ./Dockerfile
          platforms: linux/amd64,linux/arm64
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          cache-from: type=gha,scope=sampledb
          cache-to: type=gha,mode=max,scope=sampledb
          provenance: mode=max
          sbom: true

      - name: Install cosign
        uses: sigstore/cosign-installer@v3

      - name: Sign image with cosign (keyless / OIDC)
        env:
          DIGEST: ${{ steps.build.outputs.digest }}
          TAGS: ${{ steps.meta.outputs.tags }}
        run: |
          # Sign by digest so every tag for this build inherits a single signature.
          # Keyless signing uses the GitHub OIDC token (id-token: write above) and
          # records the signature in the public Rekor transparency log.
          while IFS= read -r tag; do
            [ -z "$tag" ] && continue
            cosign sign --yes "${tag}@${DIGEST}"
          done <<< "${TAGS}"

      - name: Summary
        run: |
          {
            echo "### Image published"
            echo ""
            echo "**Digest:** \`${{ steps.build.outputs.digest }}\`"
            echo ""
            echo "**Platforms:** linux/amd64, linux/arm64"
            echo ""
            echo "**Signed:** keyless (Sigstore / Rekor)"
            echo ""
            echo "**Tags:**"
            echo '```'
            echo "${{ steps.meta.outputs.tags }}"
            echo '```'
            echo ""
            echo "Verify locally with:"
            echo '```bash'
            echo "cosign verify \\"
            echo "  --certificate-identity-regexp 'https://github.com/${{ github.repository }}/.github/workflows/release-container.yml@.*' \\"
            echo "  --certificate-oidc-issuer https://token.actions.githubusercontent.com \\"
            echo "  ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}@${{ steps.build.outputs.digest }}"
            echo '```'
          } >> "$GITHUB_STEP_SUMMARY"