chore(ci): add fallback lint

.github/workflows/lint.yml

@@ -15,12 +15,16 @@
 name: Lint
 on:
   pull_request:
-    paths-ignore:
+    paths-ignore: # Changes to the paths list need to be reflected in lint_fallback.yml
       - "*.md"
+      - ".kokoro/**"
+      - ".github/**"
   pull_request_target:
     types: [labeled]
     paths-ignore:
       - "*.md"
+      - ".kokoro/**"
+      - ".github/**"
 
 jobs:
   lint:
@@ -53,6 +57,10 @@ jobs:
 
       - name: Checkout Repository
         uses: actions/checkout@v3
+        with:
+          ref: ${{ github.event.pull_request.head.sha }}
+          repository: ${{ github.event.pull_request.head.repo.full_name }}
+          token: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Setup Python
         uses: actions/setup-python@0a5c61591373683505ea898e09a3ea4f39ef2b9c # v5.0.0

.github/workflows/lint_fallback.yml

@@ -0,0 +1,30 @@
+# Copyright 2024 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: Lint
+on:
+  pull_request:
+    paths: # These paths are the inverse of lint.yml
+      - "*.md"
+      - ".kokoro/**"
+      - ".github/**"
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: none
+
+    steps:
+      - run: echo "No tests required."