Add lint job

In the past, we had lint issues which were merged into the code,
and/or lint changed without us adapting our code.

This should allow us to stay on top of linting issue by
highlighting them in PRs.

.github/workflows/go-lint.yaml

@@ -0,0 +1,16 @@
+name: "Go lint"
+on: [pull_request, push]
+
+jobs:
+  code-lint:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v1
+    - name: Lint cmd folder
+      uses: Jerome1337/golint-action@v1.0.2
+      with:
+        golint-path: './cmd/...'
+    - name: Lint pkg folder
+      uses: Jerome1337/golint-action@v1.0.2
+      with:
+        golint-path: './pkg/...'