Update pr workflow

.github/workflows/pr.yml

@@ -7,23 +7,40 @@ on:
       - '**.properties'
       - '**/src/**'
     types: [ opened, synchronize, reopened ]
-
 jobs:
   build:
-
-    runs-on: ubuntu-latest
-
+    strategy:
+      matrix:
+        java: [ 8-jdk, 11-jdk, 15-jdk ]
+    runs-on: ubuntu-20.04
+    container:
+      image: openjdk:${{ matrix.java }}
+      options: --user root
+    if: |	
+        !contains(github.event.pull_request.title, '[ci skip]')
     steps:
-      - uses: actions/checkout@v1
-      - name: Set up JDK 1.8
-        uses: actions/setup-java@v1
+      - uses: actions/cache@v2
+        with:
+          path: |
+            ~/.gradle/caches
+            ~/.gradle/wrapper
+          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle*', '**/gradle-wrapper.properties') }}
+          restore-keys: |
+            ${{ runner.os }}-gradle-
+      # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
+      - uses: actions/checkout@v2
+      - uses: gradle/wrapper-validation-action@v1
+      - name: Build with Gradle
+        run: |
+          ./gradlew build --stacktrace --no-daemon
+      - name: Upload Artifacts
+        uses: actions/upload-artifact@v2
         with:
-          java-version: 1.8
-      - name: Build snapshot
-        run: ./gradlew build --stacktrace
-        if: |
-          !contains(github.event.pull_request.title, '[ci skip]')
-      - name: Verify license integrity
+          name: '${{ github.event.repository.name }} PR${{ github.event.number }} Snapshot #${{ github.run_number }}'
+          path: |
+            **/build/libs/
+            !build/libs/
+            !**/*-shadow.jar
+            !**/*-transformProduction([\w]+).jar
+      - name: Verify License integrity
         run: ./gradlew licenseCheck
-        if: |
-          !contains(github.event.pull_request.title, '[ci skip]')