Merge pull request #623 from PlaceholderAPI/feature/621-build-jars-on-pr

Build jars on PR (Compile and build validation)

.github/workflows/pr_build_jars.yml

@@ -0,0 +1,31 @@
+name: "Test compiling against Java 8, 11 and 16"
+
+on:
+  pull_request:
+    branches:
+    - development
+    paths:
+    - "src/**"
+    - "build.gradle"
+
+jobs:
+  testBuilds:
+    name: "Test-compile against Java 8, 11 and 16"
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      max-parallel: 4
+      matrix:
+        java-version: [8, 11, 16]
+    steps:
+    - name: "Checkout Code"
+      uses: actions/checkout@v2
+    - name: "Prepare Java ${{ matrix.java-version }}"
+      uses: actions/setup-java@v2
+      with:
+        distribution: "adopt"
+        java-version: "${{ matrix.java-version }}"
+    - name: "Make build.gradle executable"
+      run: "chmod +x gradlew"
+    - name: "Build jar with Java ${{ matrix.java-version }}"
+      run: "./gradlew shadowJar"