Merge pull request #3114 from thowell:lint

PiperOrigin-RevId: 872331279
Change-Id: I26848d48e3f66f29f32a9a03ab38f373123abd1d

.github/workflows/lint.yml

@@ -0,0 +1,20 @@
+# Run pre-commit hooks on files changed in the PR only.
+name: lint
+
+on:
+  pull_request:
+
+jobs:
+  pre-commit:
+    name: pre-commit
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+      - uses: pre-commit/action@v3.0.1
+        with:
+          extra_args: --from-ref ${{ github.event.pull_request.base.sha }} --to-ref ${{ github.event.pull_request.head.sha }}

.pre-commit-config.yaml

@@ -0,0 +1,6 @@
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v5.0.0
+    hooks:
+      - id: trailing-whitespace
+      - id: end-of-file-fixer