Add gradle wrapper validation to test workflow

Signed-off-by: Heiko Kiesel <heiko.kiesel@iteratec.com>

Author: Heiko Kiesel

.github/workflows/test.yml

@@ -22,6 +22,9 @@ jobs:
           java-version: 17
           distribution: adopt
 
+      - name: Validate Gradle wrapper
+        uses: gradle/wrapper-validation-action@v1.1.0
+
       - name: Setup Gradle
         uses: gradle/gradle-build-action@v2.7.0