Add GitHub Actions workflow for automatic releases

Automatically builds and releases the plugin JAR whenever code is merged to main.
Skips releases if the version already exists to avoid duplicates.

Author: fmontes

.github/workflows/release.yml

@@ -0,0 +1,69 @@
+name: Build and Release
+
+on:
+  push:
+    branches:
+      - main
+    paths-ignore:
+      - '**.md'
+      - '.gitignore'
+
+jobs:
+  build-and-release:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up JDK 11
+        uses: actions/setup-java@v4
+        with:
+          java-version: '11'
+          distribution: 'temurin'
+
+      - name: Grant execute permission for gradlew
+        run: chmod +x gradlew
+
+      - name: Build with Gradle
+        run: ./gradlew clean jar
+
+      - name: Get version from build.gradle
+        id: get_version
+        run: |
+          VERSION=$(grep "^version = " build.gradle | cut -d "'" -f 2)
+          echo "VERSION=$VERSION" >> $GITHUB_OUTPUT
+          echo "Building version $VERSION"
+
+      - name: Check if release exists
+        id: check_release
+        run: |
+          RELEASE_EXISTS=$(gh release view "v${{ steps.get_version.outputs.VERSION }}" > /dev/null 2>&1 && echo "true" || echo "false")
+          echo "EXISTS=$RELEASE_EXISTS" >> $GITHUB_OUTPUT
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Create GitHub Release
+        if: steps.check_release.outputs.EXISTS == 'false'
+        uses: softprops/action-gh-release@v1
+        with:
+          tag_name: v${{ steps.get_version.outputs.VERSION }}
+          name: Release ${{ steps.get_version.outputs.VERSION }}
+          body: |
+            ## Google Analytics Plugin v${{ steps.get_version.outputs.VERSION }}
+
+            ### Installation
+            1. Download `google-analytics-${{ steps.get_version.outputs.VERSION }}.jar`
+            2. Upload to dotCMS via System → Dynamic Plugins
+            3. Configure via System → Apps → Google Analytics
+
+            ### What's Changed
+            See commit history for details.
+
+            **Full Changelog**: https://github.com/${{ github.repository }}/commits/v${{ steps.get_version.outputs.VERSION }}
+          files: |
+            build/libs/google-analytics-*.jar
+          draft: false
+          prerelease: false
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}