Fix liting; use golangci lint

[lukmdo]

crurrently when updating main.go or by running hack/check.sh all

• errors with

  main.go:54:1: comment on exported function GetVersionInfo should be of the form "GetVersionInfo ..."
  main.go:55:23: exported func GetVersionInfo returns unexported type main.versionInfo, which can be annoying to use
  Please fix the errors above :)

• noisy - unrelated YAML wanings (.go prefix)

  .goreleaser.yml:2:9: illegal label declaration
  .goreleaser.yml:3:7: expected ';', found '-'
  .goreleaser.yml:19:2: expected '}', found 'EOF'
  ...

this MR is to confirm

• if like to include golangci/golangci-lint in the context of deprecated golint is frozen/deprecated https://github.com/golang/go/issues/38968
• or keep as is, just update func GetVersionInfo() versionInfo to export as VersionInfo and hack/check.sh

  -".go"
  +".go$"