Add test with wrapper

Let's see, if we can just use the checked-in wrapper

Author: programming-wolf

.github/workflows/build_pr.yml

@@ -32,5 +32,5 @@ jobs:
       - name: Execute Gradle Build
         uses: gradle/gradle-build-action@v2
         with:
-          gradle-version: 7.5.1
+          gradle-version: wrapper
           arguments: buildDocs