tree be95a21ee185b8bf09845df8f00d939bca668198
parent b127831ed1f3cbfde90b3c131bd6d171ebdcd279
author Junio C Hamano <gitster@pobox.com> 1787545855 -0700
committer Junio C Hamano <gitster@pobox.com> 1787545855 -0700

Dothem/Make: prepare for proper worktree support

We used to (and we still may) depend on the new-workdir layout where
we could force checkout the same branch in the buildfarm directory.
Let's migrate it to use the officially supported worktree feature,
but be on detached HEADs.  Teach METAMAKEBRANCH environment variable
to Meta/Make, so that even a build on a detached HEAD can be told
for which branch it is building and installing.  Use the variable in
Meta/Dothem and adjust the script minimally.

So far, once the trees are set up, updating to newer revision and
building seem to work OK.  Nothing is done for bootstrapping part,
but this should do for now.