build-deploy.yml

# .github/workflows/build-deploy.yml

name: Build & Deploy

on:
  workflow_call:
    inputs:
      sha-tag:
        description: "A short-form SHA tag for the commit that triggered this workflow"
        required: true
        type: string

jobs:
  build-and-push:
    name: Build and Push Docker Image
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write

    steps:
      - name: Checkout repository
        uses: actions/checkout@v6

      - name: Log in to the Container registry
        uses: docker/login-action@v4
        with:
          registry: ghcr.io
          username: ${{ github.repository_owner }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Extract metadata for Docker
        id: meta
        uses: docker/metadata-action@v6
        with:
          images: ghcr.io/${{ github.repository }}
          tags: |
            type=raw,value=latest,enable={{is_default_branch}}
            type=raw,value=${{ inputs.sha-tag }}

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

      - name: Build and push Docker image
        uses: docker/build-push-action@v7
        with:
          context: .
          file: ./Dockerfile
          # Only push on pushes to the main branch, not on PRs
          push: ${{ github.event_name == 'push' && github.ref == 'refs/heads/main' }}
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          build-args: |
            git_sha=${{ github.sha }}
          # Use the registry for caching, this greatly speeds up subsequent builds
          cache-from: type=registry,ref=ghcr.io/${{ github.repository }}:latest
          cache-to: type=inline