add golangci-lint to project

fix #792

.golangci.yml

@@ -0,0 +1,71 @@
+# output configuration options
+output:
+  # colored-line-number|line-number|json|tab|checkstyle|code-climate, default is "colored-line-number"
+  format: colored-line-number
+
+  # print lines of code with issue, default is true
+  print-issued-lines: true
+
+  # print linter name in the end of issue text, default is true
+  print-linter-name: true
+
+linters:
+  # please, do not use `enable-all`: it's deprecated and will be removed soon.
+  # inverted configuration with `enable-all` and `disable` is not scalable during updates of golangci-lint
+  disable-all: true
+  enable:
+    - bodyclose
+    - deadcode
+    - depguard
+    - dogsled
+    - dupl
+    - errcheck
+    - funlen
+    - gochecknoinits
+    - goconst
+    - gocritic
+    - gocyclo
+    - gofmt
+    - goimports
+    - golint
+    - gomnd
+    - goprintffuncname
+    - gosec
+    - gosimple
+    - govet
+    - ineffassign
+    - interfacer
+    - lll
+    - misspell
+    - nakedret
+    - rowserrcheck
+    - scopelint
+    - staticcheck
+    - structcheck
+    - stylecheck
+    - typecheck
+    - unconvert
+    - unparam
+    - unused
+    - varcheck
+    - whitespace
+    - gocognit
+    - godox
+    - maligned
+    - prealloc
+    - wsl
+    - godot
+    - nestif
+    - gomodguard
+    - asciicheck
+
+issues:
+  # Excluding configuration per-path, per-linter, per-text and per-source
+  exclude-rules:
+    - path: _test\.go
+      linters:
+        - gomnd
+    - path: test
+      linters:
+        - gomnd
+        - dupl

Makefile

@@ -89,6 +89,10 @@ verify:
 	hack/verify-gencode.sh
 	hack/verify-vendor.sh
 
+lint: ## Lint the files
+	golangci-lint version
+	golangci-lint run pkg/kube pkg/version pkg/apis/...
+
 verify-generated-yaml:
 	./hack/check-generated-yaml.sh