ci: add swagger check

.github/actions/generate-swagger/action.yml

@@ -0,0 +1,7 @@
+name: generate swagger
+description: generate swagger files based on protobuf
+runs:
+  using: "composite"
+  steps:
+    - run: make proto-swagger-gen
+    - run: make update-swagger-docs

.github/workflows/proto.yml

@@ -19,6 +19,17 @@ jobs:
           extensions: 'proto'
           clangFormatVersion: 12
           inplace: True
+  swagger:
+    name: check generated swagger files
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/[email protected]
+        with:
+          go-version: 1.15
+      - uses: ./.github/actions/generate-swagger
+      - run: git diff-index --quiet HEAD
+
 # TODO ebony: release comment after merging initial proto files to v2 branch
 #  breakage:
 #    runs-on: ubuntu-latest