Add Gradle wrapper upgrader

.github/workflows/wrapper-upgrade-execution.yml

@@ -0,0 +1,39 @@
+name: Execute Wrapper Upgrade
+
+on:
+  schedule:
+    - cron:  '0 2 * * *'
+  workflow_dispatch:
+
+jobs:
+  upgrade_wrapper:
+    name: Execution
+    runs-on: ubuntu-latest
+    env:
+      GRADLE_ENTERPRISE_ACCESS_KEY: ${{ secrets.GE_ACCESS_TOKEN }}
+    steps:
+      - name: Set up Git configuration
+        env:
+          TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: git config --global url."https://unused-username:${TOKEN}@github.com/".insteadOf "https://github.com/"
+      - name: Import GPG key
+        uses: crazy-max/ghaction-import-gpg@cb4264d3319acaa2bea23d51ef67f80b4f775013
+        with:
+          gpg_private_key: ${{ secrets.GH_BOT_PGP_PRIVATE_KEY }}
+          passphrase: ${{ secrets.GH_BOT_PGP_PASSPHRASE }}
+          git_user_signingkey: true
+          git_commit_gpgsign: true
+          git_config_global: true
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Set up JDK 11
+        uses: actions/setup-java@v2
+        with:
+          java-version: '11'
+          distribution: 'adopt'
+      - name: Upgrade Wrappers
+        uses: gradle/gradle-build-action@v2
+        with:
+          arguments: 'upgradeGradleWrapperAll --continue'
+        env:
+          WRAPPER_UPGRADE_GIT_TOKEN: ${{ secrets.GITHUB_TOKEN }}