This change is preparation for https://review.opendev.org/c/zuul/zuul-jobs/+/887917
In the beginning, there was only prepare-workspace[0] which rsynced repos.
Then we added mirror-workspace-git[1] to make it more efficient by using git operation, but it required some openstack-specific code in project-config to work.
Then we added prepare-workspace-git[2] which completed the git-based sync solution by locating everything requried in zuul-jobs. It used mirror-workspace-git by reference and added this TODO:
# TODO(tobiash): we might want to deprecate the role mirror-workspace-git-repos
# and move it here.
This change completes that TODO by moving the mirror-workspace-git-repos code into prepare-workspace-git and places the repo in a sensible and maintainable state with two simple and good options:
* prepare-workspace (rsync)
* prepare-workspace-git (git)
In the unlikely event anyone is still using mirror-workspace-git-repos standalone (OpenStack/OpenDev is not, and that solution was haphazard as described above) they would be well served by a notification that there is a better alternative which is what most of the community actually uses now.
[0] cfffd4431b8efc2f4df1999ecb89384a29c59238
[1] 348598e96aac742954fa326a15a4ef8fd7f71b8b
[2] 7cee7156bcde8bc396ac4b6581bf2cae02eea0e9
Change-Id: Ib80e0447d49363182fd0d4c4d4e269841bc3aa95
ce2bea51d4