Add golangci-lint

.github/workflows/codeql.yml

@@ -4,7 +4,6 @@ on:
   push:
     branches: [ master ]
   pull_request:
-    branches: [ master ]
 
 jobs:
   build:

.github/workflows/go.yml

@@ -4,7 +4,6 @@ on:
   push:
     branches: [ master ]
   pull_request:
-    branches: [ master ]
 
 jobs:
   build:

.github/workflows/lint.yml

@@ -0,0 +1,22 @@
+name: CI
+
+on: [push, pull_request]
+
+jobs:
+  # The "build" workflow
+  lint:
+    # The type of runner that the job will run on
+    runs-on: ubuntu-latest
+
+    # Steps represent a sequence of tasks that will be executed as part of the job
+    steps:
+      # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
+      - uses: actions/checkout@v2
+
+      # Install and run golangci-lint as a separate step, it's much faster this
+      # way because this action has caching. It'll get run again in `make lint`
+      # below, but it's still much faster in the end than installing
+      # golangci-lint manually in the `Run lint` step.
+      - uses: golangci/golangci-lint-action@v2
+        with:
+          only-new-issues: true