feat: add lint checks for configurations

Author: minherz

.github/workflows/configurations.yaml

@@ -0,0 +1,40 @@
+# 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
+#
+#      https://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: Configurations
+
+concurrency:
+  group: "configurations-${{ github.workflow }}-${{ github.ref }}"
+  cancel-in-progress: true
+
+on:
+  pull_request:
+    types: [opened,synchronize,reopened]
+    paths:
+    - 'applications/**/*.yaml'
+
+
+jobs:
+
+  yamllint:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+
+    steps:
+    - name: Checkout source code
+      uses: actions/checkout@v3
+      
+    - name: Check CLI script
+      run: yamllint configurations/**/*.yaml configurations/**/*.yml