Setup golangci-lint GitHub action.

Part of "Enhance the static-analysis workflow" issue. #14164

Signed-off-by: Cenk Alti <cenkalti@gmail.com>

.github/workflows/static-analysis.yaml

@@ -13,6 +13,10 @@ jobs:
       - uses: actions/setup-go@v2
         with:
           go-version: "1.17.8"
+      - name: golangci-lint
+        uses: golangci/golangci-lint-action@v3
+        with:
+          version: v1.49.0
       - run: date
       - env:
           TARGET: ${{ matrix.target }}

CONTRIBUTING.md

@@ -96,4 +96,4 @@ commit using message with a more generic `*:` prefix.
 
 We recommend that you install [golangci-lint](https://golangci-lint.run/usage/install/) and run `make lint`.
 
-Very soon we will have a GitHub action to run our linters.
+We also have a GitHub action to run our linters on every pull request.