Add Github workflow for CI PRs

Author: onobc

.github/workflows/ci-pr.yml

@@ -0,0 +1,16 @@
+name: CI PRs
+on: [pull_request]
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v2
+      - name: Set up Java 17
+        uses: actions/setup-java@v2
+        with:
+          java-version: 17
+          distribution: 'temurin'
+          cache: gradle
+      - name: Build with Gradle
+        run: ./gradlew build --no-daemon