deploy.yml

name: Publish Docker to GitHub Container Registry

on:
  push:
    branches:
      - master
  workflow_dispatch:

permissions:
  contents: read
  packages: write

jobs:
  publish:
    name: Build and publish to ghcr
    runs-on: ubuntu-latest

    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

      - name: Set up QEMU (for multi-arch, optional)
        uses: docker/setup-qemu-action@v2

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v2

      - name: Log in to GitHub Container Registry
        uses: docker/login-action@v2
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Compute lowercase repo and image tags
        id: vars
        run: |
          repo_lower=$(echo "$GITHUB_REPOSITORY" | tr '[:upper:]' '[:lower:]')
          image_sha="ghcr.io/${repo_lower}:${GITHUB_SHA}"
          image_latest="ghcr.io/${repo_lower}:latest"
          echo "repo_lower=${repo_lower}" >> $GITHUB_OUTPUT
          echo "image_sha=${image_sha}" >> $GITHUB_OUTPUT
          echo "image_latest=${image_latest}" >> $GITHUB_OUTPUT

      - name: Build and push Docker image
        uses: docker/build-push-action@v4
        with:
          context: .
          file: ./Dockerfile
          push: true
          tags: |
            ${{ steps.vars.outputs.image_sha }}
            ${{ steps.vars.outputs.image_latest }}
          cache-from: type=registry,ref=ghcr.io/${{ steps.vars.outputs.repo_lower }}:cache
          cache-to: type=inline

      - name: Output image information
        run: |
          echo "IMAGE=${{ steps.vars.outputs.image_sha }}" >> $GITHUB_OUTPUT
          echo "Image published to ${{ steps.vars.outputs.image_sha }}"