name: Docker Build & Push

on:
  workflow_call:
    inputs:
      push:
        description: "Push image to GHCR"
        type: boolean
        required: true
    outputs:
      image-digest:
        description: "Pushed image digest (sha256:…)"
        value: ${{ jobs.docker.outputs.image-digest }}
      image-tags:
        description: "Comma-separated list of applied tags"
        value: ${{ jobs.docker.outputs.image-tags }}

jobs:
  docker:
    name: Docker Build & Push
    runs-on: ubuntu-latest
    timeout-minutes: 20
    outputs:
      image-digest: ${{ steps.build-push.outputs.digest }}
      image-tags: ${{ steps.meta.outputs.tags }}
    steps:
      - name: Checkout source
        uses: actions/checkout@v6

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

      - name: Validate Dockerfile
        if: inputs.push == false
        uses: docker/build-push-action@v7
        with:
          context: .
          file: ./Containerfile
          call: check

      - name: Log in to GHCR
        if: inputs.push == true
        uses: docker/login-action@v4
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Extract Docker metadata
        if: inputs.push == true
        id: meta
        uses: docker/metadata-action@v6
        with:
          images: ghcr.io/${{ github.repository }}
          tags: |
            type=semver,pattern={{version}}
            type=semver,pattern={{major}}.{{minor}}
            type=ref,event=branch
            type=ref,event=pr
            type=sha,prefix=sha-

      - name: Build and push image
        if: inputs.push == true
        id: build-push
        uses: docker/build-push-action@v7
        with:
          context: .
          file: ./Dockerfile
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          provenance: false
          cache-from: type=gha
          cache-to: type=gha,mode=max