The commit graph can be quite slow for repositories like nixpkgs, so it
is disabled there. For this we refactor the module a bit, allowing us to
set arbitrary cgit settings for repositories. This feature can also
handle all instances of defaultBranch now.
Change-Id: I22e44b7398d2692e8cc16555fb5203ad6a7a69a9
Reviewed-on: https://cl.tvl.fyi/c/depot/+/7672
Reviewed-by: sterni <sternenseemann@systemli.org>
Autosubmit: sterni <sternenseemann@systemli.org>
Tested-by: BuildkiteCI