main.yml

name: Build GraalVM JRE Docker Image

on:
  push:
    branches:
      - main
  workflow_dispatch:
  schedule:
    # Runs every day at midnight (UTC)
    - cron: "0 0 * * *"

jobs:
  check-and-build:
    runs-on: ubuntu-latest
    strategy:
      matrix:
        java_version: [17, 21, 22, 23]

    steps:
      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3
        with:
          install: true

      - name: Install dependencies
        run: |
          sudo apt-get update
          sudo apt-get install -y curl grep sed

      - name: Log in to GitHub Container Registry
        run: |
          echo "${{ secrets.GITHUB_TOKEN }}" | docker login ghcr.io -u ${{ github.actor }} --password-stdin

      - name: Check latest GraalVM version for Java ${{ matrix.java_version }}
        id: check_version
        run: |
          JAVA_VERSION=${{ matrix.java_version }}
          RELEASE_NOTES_URL="https://docs.oracle.com/en/graalvm/jdk/$JAVA_VERSION/docs/release-notes/"
          LATEST_VERSION=$(curl -s "$RELEASE_NOTES_URL" | grep -oE "[0-9]+\.[0-9]+\.[0-9]+" | grep "^$JAVA_VERSION" | head -n 1)
    
          if [ -z "$LATEST_VERSION" ]; then
            LATEST_VERSION="${JAVA_VERSION}.0.0"
            echo "No patch version found. Defaulting to: $LATEST_VERSION"
          else
            echo "Latest GraalVM version for Java $JAVA_VERSION: $LATEST_VERSION"
          fi
          
          echo "Latest GraalVM version for Java $JAVA_VERSION: $LATEST_VERSION"
          
          # Use docker manifest inspect to check if the image already exists
          if docker manifest inspect "ghcr.io/${{ github.repository_owner }}/graalvm-oracle-jre:$LATEST_VERSION" > /dev/null 2>&1; then
            echo "Docker image with Tag $LATEST_VERSION already exists."
            echo "new_version=false" >> $GITHUB_ENV
          else
            echo "New version detected for Java $LATEST_VERSION"
            echo "new_version=true" >> $GITHUB_ENV
            echo "LATEST_VERSION=$LATEST_VERSION" >> $GITHUB_ENV
            echo "JAVA_VERSION=$JAVA_VERSION" >> $GITHUB_ENV
          fi

      - name: Build and push Docker image
        if: env.new_version == 'true'
        uses: docker/build-push-action@v6
        env:
          GRAALVM_VERSION: ${{ env.LATEST_VERSION }}
          JAVA_VERSION: ${{ matrix.java_version }}
        with:
          file: Dockerfile
          build-args: |
            GRAALVM_VERSION=${{ env.LATEST_VERSION }}
            JAVA_MAJOR_VERSION=${{ matrix.java_version }}
          platforms: linux/amd64,linux/arm64/v8
          tags: |
            ghcr.io/${{ github.repository_owner }}/graalvm-oracle-jre:${{ env.LATEST_VERSION }}
          push: true
          provenance: false