Mirror directory names have the digits stripped from the repository name

[pgrenaud]

No idea why it was made this way in the first place, but this regex strips digits from the repository name before creating the directory for the git mirror.

(parsed_url.host + parsed_url.path.gsub(/\.git$/, '')).gsub(/[\\\/]+/, '_').gsub(/[^A-Za-z._-]/, '')[0..64]

https://github.com/eXolnet/redmine_git_mirror/blob/master/app/models/repository/git_mirror.rb#L120

I would really help reading the directory names if they were matching the their name on GitHub. And since GitHub allow digits, we probably should review the regex. I was not able to find an official source from GitHub stating that, but I found a few place mentioning it.

Repository name should contain only alphanumeric, dash ('-'), underscore ('_') and dot ('.') characters.

go-gitea/gitea#13943

it looks like github allows [A-Za-z0-9_.-], and transforms all other characters to "-".

https://stackoverflow.com/a/59082561