docker.yml

name: Docker Image CI (GHCR)

on:
  push:
    branches: [ master ]
  release:
    types: [ published ]
  workflow_dispatch: {}

jobs:
  build-and-push:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write
    env:
      IMAGE_NAME: unet-lungs-segmentation

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

      - name: Compute owner + version
        id: vars
        shell: bash
        run: |
          OWNER_LC="${GITHUB_REPOSITORY_OWNER,,}"
          VERSION="$(grep -Po '^[[:space:]]*version[[:space:]]*=[[:space:]]*\K.*' setup.cfg || true)"
          if [ -z "$VERSION" ]; then VERSION="${GITHUB_SHA::7}"; fi
          echo "owner=${OWNER_LC}" >> "$GITHUB_OUTPUT"
          echo "version=${VERSION}" >> "$GITHUB_OUTPUT"

      - name: Set up QEMU
        uses: docker/setup-qemu-action@v3

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3

      - name: Log in to GHCR
        uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Build and push
        uses: docker/build-push-action@v5
        with:
          context: .
          push: true
          tags: |
            ghcr.io/${{ steps.vars.outputs.owner }}/${{ env.IMAGE_NAME }}:latest
            ghcr.io/${{ steps.vars.outputs.owner }}/${{ env.IMAGE_NAME }}:${{ steps.vars.outputs.version }}
            ghcr.io/${{ steps.vars.outputs.owner }}/${{ env.IMAGE_NAME }}:${{ github.sha }}
          labels: |
            org.opencontainers.image.source=${{ github.server_url }}/${{ github.repository }}