Add a configuration parameter to automatically archive merged branches

[jeremystretch]

Plugin Version

v0.4.0

Proposed functionality

Introduce a new configuration parameter, e.g. auto_archive_days, with a default of perhaps 30 days. Branches which were merged more than this long ago will be automatically archived via a daily task.

Setting this parameter to None will disable automatic archiving.

Use case

This will provide a convenient housekeeping mechanism to automatically clean up old branches which are no longer needed and help combat database bloat.

External dependencies

No response