First attempt at java version matrix build

.github/workflows/maven.yml

@@ -4,17 +4,23 @@ on: [push, pull_request]
 
 jobs:
   build:
+    strategy:
+      matrix:
+        java-version: [1.8,11]
+
     runs-on: ubuntu-latest
 
     steps:
     - name: Checkout
       uses: actions/checkout@v2
       with:
         fetch-depth: 0
-    - name: Set up JDK 1.8
+
+    - name: Set up JDK ${{matrix.java-version}}
       uses: actions/setup-java@v1
       with:
-        java-version: 1.8
+        java-version: ${{matrix.java-version}}
+
     - name: Cache Maven packages
       uses: actions/cache@v1
       with:
@@ -34,6 +40,7 @@ jobs:
       run: |
         cp iam-login-service/target/iam-login-service.war iam-login-service/docker
         cp iam-test-client/target/iam-test-client.jar iam-test-client/docker
+
     - name: Build & push iam-login-service docker image
       uses: docker/build-push-action@v1
       with:
@@ -44,7 +51,8 @@ jobs:
         tag_with_sha: true
         dockerfile: iam-login-service/docker/Dockerfile.prod
         path: iam-login-service/docker
-        push: ${{ startsWith(github.ref, 'refs/tags/') }}
+        push: ${{ matrix.java-version == '11' && startsWith(github.ref, 'refs/tags/') }}
+
     - name: Build & push iam-test-client docker image
       uses: docker/build-push-action@v1
       with:
@@ -55,4 +63,4 @@ jobs:
         tag_with_sha: true
         dockerfile: iam-test-client/docker/Dockerfile.prod
         path: iam-test-client/docker
-        push: ${{ startsWith(github.ref, 'refs/tags/') }}
+        push: ${{ matrix.java-version == '11' && startsWith(github.ref, 'refs/tags/') }}