Fix golangci-lint check and update config

The .golangci.yml now reflects all linters, whereas the lint issue for
the deprecated protobuf package has been disabled. This is reasoned
because testgrid still uses the package and we have no chance to fix it
within this repository.

Signed-off-by: Sascha Grunert <sgrunert@suse.com>

.golangci.yml

@@ -13,6 +13,7 @@ issues:
 linters:
   disable-all: true
   enable:
+    - asciicheck
     - bodyclose
     - deadcode
     - depguard
@@ -24,8 +25,10 @@ linters:
     - gocyclo
     - godox
     - gofmt
+    - goheader
     - goimports
     - golint
+    - gomodguard
     - goprintffuncname
     - gosimple
     - govet
@@ -36,6 +39,7 @@ linters:
     - nakedret
     - prealloc
     - rowserrcheck
+    - sqlclosecheck
     - staticcheck
     - structcheck
     - stylecheck
@@ -45,14 +49,25 @@ linters:
     - unused
     - varcheck
     - whitespace
+    # - exhaustive
+    # - exportloopref
     # - funlen
+    # - gci
     # - gochecknoglobals
     # - gochecknoinits
     # - gocognit
+    # - godot
+    # - goerr113
+    # - gofumpt
     # - gomnd
     # - gosec
     # - lll
+    # - nestif
+    # - nlreturn
+    # - noctx
+    # - nolintlint
     # - scopelint
+    # - testpackage
     # - wsl
 linters-settings:
   godox:

pkg/testgrid/testgrid_test.go

@@ -21,7 +21,7 @@ import (
 	"testing"
 
 	pb "github.com/GoogleCloudPlatform/testgrid/pb/config"
-	"github.com/golang/protobuf/proto"
+	"github.com/golang/protobuf/proto" // nolint: staticcheck
 	"github.com/stretchr/testify/require"
 
 	"k8s.io/release/pkg/git"