Automatically apply spotless where required. (#1085)

.github/workflows/main.yml

@@ -0,0 +1,41 @@
+# Copyright 2023 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+name: Apply Spotless
+
+on:
+  pull_request:
+  workflow_dispatch:
+
+# A workflow run is made up of one or more jobs that can run sequentially or in parallel
+jobs:
+  spotlessApply:
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+
+    steps:
+    - uses: actions/checkout@v3
+
+    - name: set up Java 11
+      uses: actions/setup-java@v2
+      with:
+        distribution: 'adopt'
+        java-version: '11'
+
+    - name: Apply spotless formatting
+      run: ./scripts/format.sh
+
+    - uses: stefanzweifel/git-auto-commit-action@v4
+      with:
+        commit_message: 🤖 Apply Spotless