[MacPorts] #54180: documentation for new portfile with git HEAD no tarball

[MacPorts]

#54180: documentation for new portfile with git HEAD no tarball
----------------------------+---------------------------
  Reporter:  gaming-hacker  |      Owner:
      Type:  update         |     Status:  new
  Priority:  Normal         |  Milestone:
 Component:  guide          |    Version:  2.4.1
Resolution:                 |   Keywords:  documentation
      Port:                 |
----------------------------+---------------------------

Comment (by gaming-hacker):

 forgot to add for item 1.
 especially if i need to use multiple git commands to pull source from main
 repo and cherry-pick fromm others or include PRs not merged in master

--
Ticket URL: <https://trac.macports.org/ticket/54180#comment:1>
MacPorts <https://www.macports.org/>
Ports system for macOS