Gopkg.toml was used by dep, Go's original dependency management tool. It was an experiment that culminated in official and built-in support for Go modules in mid 2018, and dep was deprecated and archived in mid 2020 per https://github.com/golang/go/issues/38158. Now, in 2023, Gopkg.toml files are incredibly rare in actively developed Go projects, as people use go.mod with Go modules instead. While here, also add go.work as a root file, since that is used by Go module workspaces, added in Go 1.18 in early 2022. gopls or commands like `go build` work inside either go.work or go.mod. These two root files are the same ones used by gopls integrations with other editors like vim or neovim.