Improve compile times

.github/workflows/ci.yml

@@ -0,0 +1,39 @@
+# 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.
+
+# GitHub action that runs https://github.com/adRise/update-pr-branch on each push to
+# `main`. `update-pr-branch` will pick the oldest PR (by creation date) that is approved
+# with auto-merge enabled and update it to the latest `main`, forming a best-effort queue
+# of approved PRs.
+
+name: Validate protobufs
+
+on:
+  push:
+    branches:
+      - "main"
+  pull_request:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+jobs:
+  validate:
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v4
+        with:
+            submodules: true
+      - run: cargo run -p proto-gen -- validate

.gitmodules

@@ -1,12 +1,3 @@
-[submodule "proto/data-plane-api"]
-	path = proto/data-plane-api
-	url = https://github.com/envoyproxy/data-plane-api.git
-[submodule "proto/udpa"]
-	path = proto/udpa
-	url = https://github.com/cncf/xds.git
 [submodule "proto/protoc-gen-validate"]
 	path = proto/protoc-gen-validate
 	url = https://github.com/envoyproxy/protoc-gen-validate.git
-[submodule "proto/googleapis"]
-	path = proto/googleapis
-	url = https://github.com/googleapis/googleapis.git