Added Github workflow martix for JDK 1.8, 11 & 15.

.github/workflows/gradle.yml

@@ -6,8 +6,8 @@ jobs:
   build:
     runs-on: ubuntu-latest
     env:
-      CI_NAME: "GitHub CI"
       GRADLE_OPTS: "-Dorg.gradle.jvmargs=-XX:MaxMetaspaceSize=512m"
+      SONAR_JDK: "11"
     strategy:
       matrix:
         java-version: [ 11, 15 ]
@@ -15,13 +15,14 @@ jobs:
       - uses: actions/checkout@v2
         with:
           fetch-depth: 0
-      - name: Set up JDK 11
+      - name: Set up JDK ${{ matrix.java-version }}
         uses: actions/setup-java@v1
         with:
           java-version: ${{ matrix.java-version }}
       - name: Grant execute permission for gradlew
         run: chmod +x gradlew
       - name: Cache SonarCloud packages
+        if: matrix.java-version == env.SONAR_JDK
         uses: actions/cache@v1
         with:
           path: ~/.sonar/cache
@@ -39,7 +40,7 @@ jobs:
       - name: Test with Gradle
         run: ./gradlew build check --stacktrace
       - name: SonarCloud
-        if: matrix.java-version == '11'
+        if: success() && matrix.java-version == env.SONAR_JDK
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}