Fix linting issues

.github/workflows/lint.yaml

@@ -0,0 +1,23 @@
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+name: golangci-lint
+
+jobs:
+  lint:
+    name: Lint
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Lint
+        uses: golangci/golangci-lint-action@v2
+        with:
+          version: v1.31
+          skip-build-cache: true
+          skip-pkg-cache: true
+          args: --build-tags "containers_image_openpgp containers_image_ostree"
+
+