- Enforce [gofumpt](https://github.com/mvdan/gofumpt) to enforce a more idiomatic go style.
- Enforce golangci-lint a bunch of linters! Which were able to detect a few issues in the current codebase and have been fixed by this PR.
- Updated the Makefile to use `go install ....` instead of the old deprecated way of `go get`
Reviewed-on: https://gitea.com/gitea/go-sdk/pulls/587
Reviewed-by: John Olheiser <john.olheiser@gmail.com>
Reviewed-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: Gusted <williamzijl7@hotmail.com>
Co-committed-by: Gusted <williamzijl7@hotmail.com>
