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.