still testing Github CI workflow

Author: LorenzBuehmann

.github/workflows/ci-workflow.yml

@@ -7,16 +7,19 @@ on:
 jobs:
   build:
     name: Compile
-    # This job runs on Linux
+    strategy:
+      matrix:
+        java_version: [8, 9, 10]
+        os: [ubuntu-latest, windows-latest, macOS-latest]
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v1
       - name: Set up JDK 1.8
-          uses: actions/setup-java@v1
-          with:
-            java-version: 1.8
-            - name: Build with Maven
-              run: mvn package --file pom.xml
+        uses: actions/setup-java@v1
+        with:
+          java-version: 1.8
+      - name: Build with Maven
+        run: mvn package --file pom.xml
       - run: echo The time was ${{ steps.hello.outputs.time }}