Add Build Gradle Pr Workflow

Signed-off-by: Joseph T. McQuigg <[email protected]>

.github/workflows/gradle-pr-build.yml

@@ -0,0 +1,35 @@
+name: Build Gradle for Pull Request
+
+on:
+  pull-request:
+    branches:
+      - 1.21.1
+      - 1.20.1
+    types:
+      - synchronize
+      - opened
+      - reopened
+
+jobs:
+  gradle:
+    strategy:
+      matrix:
+        os: [ ubuntu-latest ]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up JDK 21
+        uses: actions/setup-java@v4
+        with:
+          distribution: adopt
+          java-version: 21
+          cache: gradle
+
+      - name: Setup Gradle
+        uses: gradle/actions/setup-gradle@v3
+
+      - name: Change wrapper permissions
+        run: chmod +x ./gradlew
+
+      - name: Execute Gradle build
+        run: ./gradlew build  --scan