feat(users/Profpatsch): add git-db r/3423

WIP: currently just a simple setup that creates an empty git repo if
it doesn’t exist yet, and writes a commit to it.

A simple database backed by a bare git repository.

WIP: Will speak a simple interactive protocol to query files and
update them atomically.

It could be made atomic on the git repo level, if a lock is taken
between reading the current commit ref and creating the commit.

Change-Id: I1fd30a046ac977063c3e08c36d96e835b35ff07d
Reviewed-on: https://cl.tvl.fyi/c/depot/+/3046
Tested-by: BuildkiteCI
Reviewed-by: Profpatsch <mail@profpatsch.de>

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