chore: Add compatibility tests for older Keycloak versions

.github/workflows/buildAndTest.yml

@@ -8,9 +8,7 @@ on:
 
 jobs:
   build:
-
     runs-on: ubuntu-latest
-
     steps:
     - uses: actions/checkout@v2
     - name: Set up JDK 11
@@ -27,5 +25,26 @@ jobs:
           ${{ runner.os }}-maven-
     - name: Build
       run: mvn -B clean package --file pom.xml
-    - name: Integration Test
+    - name: Integration test
       run: mvn -B failsafe:integration-test failsafe:verify --file pom.xml
+  compatibility:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        keycloak: [ 12.0.4, 13.0.1, 14.0.0 ]
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up JDK 11
+        uses: actions/setup-java@v2
+        with:
+          distribution: 'adopt'
+          java-version: 11
+      - name: Cache maven repository
+        uses: actions/cache@v2
+        with:
+          path: ~/.m2/repository
+          key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
+          restore-keys: |
+            ${{ runner.os }}-maven-
+      - name: Compatibility tests
+        run: mvn -B clean test-compile failsafe:integration-test failsafe:verify --file pom.xml -Dversion.keycloak=${{ matrix.keycloak }}