Add gradle wrapper validation

Author: jmfayard

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

@@ -0,0 +1,18 @@
+name: Validate Gradle Wrapper
+on:
+    push:
+        branches:
+            - main
+    pull_request:
+        branches:
+            - '*'
+
+jobs:
+    validation:
+        name: Validation
+        runs-on: ubuntu-latest
+        steps:
+            - name: Checkout latest code
+              uses: actions/checkout@v2
+            - name: Validate Gradle Wrapper
+              uses: gradle/wrapper-validation-action@v1.0.3