ci(workflow): add workflow to lint, fmt and test

[steebchen]

No description provided.

[github-actions]

golint

client.go:12:6: exported type Request should have comment or be unexported
client.go:18:1: exported method GQLClient.MustSend should have comment or be unexported
client.go:28:6: exported type Error should have comment or be unexported
client.go:34:6: exported type ResponseData should have comment or be unexported
client.go:40:1: exported method GQLClient.Send should have comment or be unexported
client.go:56:1: exported method GQLClient.Raw should have comment or be unexported
gqlclient.go:8:1: comment on exported type GQLClient should be of the form "GQLClient ..." (with optional leading article)
gqlclient.go:24:1: exported method GQLClient.WithHTTPClient should have comment or be unexported
json.go:10:6: type rawJsonError should be rawJSONError