try matrix java builds

Author: csviri

.github/workflows/ci.yml

@@ -13,12 +13,15 @@ jobs:
   build:
 
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        java: [8, 11]
 
     steps:
-    - uses: actions/checkout@v2
-    - name: Set up JDK 1.8
-      uses: actions/setup-java@v1
-      with:
-        java-version: 1.8
-    - name: Build with Maven
-      run: mvn -B package -P no-integration-tests --file pom.xml
+      - uses: actions/checkout@v2
+      - name: Set up JDK
+        uses: actions/setup-java@v1
+        with:
+          java-version: ${{ matrix.java }}
+      - name: Build with Maven
+        run: mvn -B package -P no-integration-tests --file pom.xml