ci: add GitHub workflow to check and lint proto files

.github/workflows/proto-checker.yml

@@ -0,0 +1,30 @@
+name: Check Protobuf Files
+
+on:
+  pull_request:
+    paths:
+      - "proto/**"
+
+permissions:
+  contents: read
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    steps:
+      - uses: actions/checkout@v3
+      - uses: bufbuild/[email protected]
+      - uses: bufbuild/buf-lint-action@v1
+        with:
+          input: "proto"
+
+  break-check:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: bufbuild/[email protected]
+      - uses: bufbuild/buf-breaking-action@v1
+        with:
+          input: "proto"
+          against: "https://github.com/${{ github.repository }}.git#branch=${{ github.event.pull_request.base.ref }},ref=HEAD~1,subdir=proto"