master/.github/workflows/release.yml

name: Release

on:
  push:
    branches: [master]

# Prevent concurrent releases
concurrency:
  group: release
  cancel-in-progress: false

jobs:
  release:
    runs-on: ubuntu-latest
    permissions:
      contents: write

    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0 # full history for tag checks

      - name: Set up JDK 17
        uses: actions/setup-java@v4
        with:
          java-version: '17'
          distribution: 'temurin'

      - name: Setup Gradle
        uses: gradle/actions/setup-gradle@v4

      - name: Extract version from build.gradle.kts
        id: version
        run: |
          VERSION=$(grep -oP 'version\s*=\s*"\K[^"]+' build.gradle.kts)
          echo "version=$VERSION" >> "$GITHUB_OUTPUT"
          echo "Detected version: $VERSION"

      - name: Check if tag already exists
        id: tag_check
        run: |
          if git rev-parse "v${{ steps.version.outputs.version }}" >/dev/null 2>&1; then
            echo "exists=true" >> "$GITHUB_OUTPUT"
            echo "Tag v${{ steps.version.outputs.version }} already exists — skipping release."
          else
            echo "exists=false" >> "$GITHUB_OUTPUT"
          fi

      - name: Build
        if: steps.tag_check.outputs.exists == 'false'
        run: ./gradlew build

      - name: Create tag and GitHub release
        if: steps.tag_check.outputs.exists == 'false'
        uses: softprops/action-gh-release@v2
        with:
          tag_name: v${{ steps.version.outputs.version }}
          name: v${{ steps.version.outputs.version }}
          generate_release_notes: true
          files: build/libs/*.jar