build.yml

name: Publish and Sign Container Image

env:
  REGISTRY: ghcr.io

on:
  push:
    branches:
      - main
    paths:
      - .github/workflows/build.yml
      - '**/Dockerfile'

jobs:
  build-push-image:
    runs-on: ubuntu-24.04

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

    strategy:
      fail-fast: false
      matrix:
        include:
          - image: spotify
            file: distroboxes/spotify/Dockerfile
          - image: steam
            file: distroboxes/steam/Dockerfile

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

      - name: Install cosign
        uses: sigstore/cosign-installer@v3
        with:
          cosign-release: "v2.4.1"


      - name: Extract metadata (tags, labels) for Docker
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: |
            ${{ env.REGISTRY }}/${{ github.repository_owner }}/${{ matrix.image }}-container
          tags: |
            latest
            type=sha,format=long

      - name: Log into ${{ env.REGISTRY }}
        uses: docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.repository_owner }}
          password: ${{ github.token }}

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

      - name: Sign the container image
        run: cosign sign --yes ${{ env.REGISTRY }}/${{ github.repository_owner }}/${{ matrix.image }}-container@${{ steps.push-step.outputs.digest }}