build-and-publish-image.yml

name: Build Docker Image

on:
  push:
    branches: [main]
    tags:
      - v[0-9]+.[0-9]+.[0-9]+
  pull_request:
    branches: [main]

jobs:
  build:
    runs-on: ubuntu-24.04
    permissions:
      packages: write
    steps:
      - uses: actions/checkout@v4

      - name: Set up JDK 21
        uses: actions/setup-java@v4
        with:
          java-version: "21"
          distribution: "temurin"

      - name: Validate Gradle wrapper
        uses: gradle/actions/wrapper-validation@v3

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

      - name: Login to GitHub Container Registry
        uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.repository_owner }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Extract metadata (tags, labels) for Docker
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ghcr.io/${{ github.repository_owner }}/gamma
          tags: |
            type=semver,pattern={{version}}
            type=semver,pattern={{major}}.{{minor}}
            type=semver,pattern={{major}}
            type=sha
            type=ref,event=branch
            type=ref,event=pr  

      - name: Build Docker image
        run: ./gradlew bootBuildImage

      - name: Push docker image
        run: |
          for tag in $(jq -r '.tags | join(" ")' <<< "${{ steps.meta.outputs.metadata }}"); do
            docker image tag app:latest $tag
          done
          docker image push --all-tags ghcr.io/${{ github.repository_owner }}/gamma