Merge pull request #5624 from nextcloud/gradleWrapperValidation

Gradle wrapper validation

.github/workflows/gradle-wrapper-validation.yml

@@ -0,0 +1,10 @@
+name: "Validate Gradle Wrapper"
+on: [push, pull_request]
+
+jobs:
+    validation:
+        name: "Validation"
+        runs-on: ubuntu-latest
+        steps:
+            -   uses: actions/checkout@v2
+            -   uses: gradle/wrapper-validation-action@v1