Support passing temporary configuration options to yadm

[Tank-Missile]

Is your feature request related to a problem? Please describe.

There is currently no way for yadm to use configuration options passed via git's -c option. This would allow for temporarily changing certain options such as local.hostname, which would be useful for running yadm inside a chroot.

Describe the solution you'd like

Support git's -c option by allowing any configuration option to be passed to yadm (e.g. yadm -c local.hostname=different-hostname -c yadm.auto-alt=false bootstrap).

[github-actions]

This issue has been labeled as stale because it has been open 60 days with no activity. Remove stale label or comment or this will be closed in 7 days.

[github-actions]

This issue has been labeled as stale because it has been open 60 days with no activity. Remove stale label or comment or this will be closed in 7 days.