With this extension a git hash can be easily referenced.
The porters handbook versions chapter uses this extension
as an example in the FreeBSD 14.0 version table.
An example of use
gitref:hash[repository="src|doc|ports",length=hash-longitude]
The repository should be src, doc or ports.
And if no length it's specified the macro will use 12 characters
of the specified hash.
PR: 253050
Submitted by: jhb@
fb36cfdfb2