Gate PRs on CMake and bazel headers matching (#381)

This will prevent future issues similar to #359 from occurring in the
first place.

Fixes #255.

.github/workflows/compare-cmake-and-bazel-headers.yml

@@ -0,0 +1,37 @@
+# Copyright 2025 Aurora Operations, Inc.
+#
+# 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: compare-cmake-and-bazel-headers
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+jobs:
+  compare-cmake-and-bazel-headers:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@44c2b7a8a4ea60a981eaca3cf939b5f4305c123b #v4.1.5
+      - name: Setup CMake
+        uses: jwlawson/actions-setup-cmake@802fa1a2c4e212495c05bf94dba2704a92a472be #v2.0.2
+        with:
+          cmake-version: '3.29.x'
+      - name: Set up python
+        uses: actions/setup-python@39cd14951b08e74b54015e9e001cdefcf80e669f #v5.1.1
+        with:
+          python-version: '3.10'
+      - name: Check that CMake headers match bazel headers
+        run: ./tools/bin/check-cmake-headers