[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
 Keywords:  documentation  |       Port:
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 the documentation
 https://guide.macports.org/#development.creating-portfile

 is lacking a decent example of how to create a new portfile from a git
 repo, HEAD, not a released/stable tarball

 1. there is no indication of how to create a sha256 checksum/hash

 2. there is no indication of how to pass CMAKE macro definitions when
 there is no configure

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Ticket URL: <https://trac.macports.org/ticket/54180>
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