Added lint as action (#30)

This gives cleaner integration compared to digging around in cloudbuild output. We still may need to do GCB integration to perform further checks though. https://github.com/golangci/golangci-lint-action

.github/workflows/golangci-lint.yml

@@ -0,0 +1,22 @@
+name: golangci-lint
+on:
+  push:
+  pull_request:
+permissions:
+  contents: read
+  # Optional: allow read access to pull request. Use with `only-new-issues` option.
+  # pull-requests: read
+jobs:
+  golangci:
+    name: lint
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/setup-go@v3
+        with:
+          go-version: 1.17
+      - uses: actions/checkout@v3
+      - name: golangci-lint
+        uses: golangci/golangci-lint-action@v3
+        with:
+          # Optional: version of golangci-lint to use in form of v1.2 or v1.2.3 or `latest` to use the latest version
+          version: v1.46.1