There is no such thing as a standard here.
In our team we have most projects structured like this:
/project-folder
|
|__/build (/.gitlab-ci for projects moved to our own gitlab instance)
|
|__/cmd (folder for your entrypoints. One or more if your projects generates more than 1 binary)
|__/bin_name1
|__/bin_name2
|
|__/internal (folder for your sources packages)
|__/config (package config)
|__/http (package HTTPServer, api, etc)
|__/api
|__/models
|__/database (package database)
|__...
|
|__/api (swagger and such)
|
|__/docs (godoc)
|
|__/.golangci.yml
|
|__...
Something like this.