ci-fairy: allow use of private commit email address

GitLab provides an automatically generated private commit email address, so that I can keep my email address private. See the docs. The email address has the form <number>-<username>@users.noreply.<gitlab instance domain>.

ci-fairy throws error "git author email invalid" when I use the private commit email address. See here in the code. I ask that this be reconsidered and private commit email addresses are allowed to be used. These are a standard GitLab function.

I'm not comfortable publicly disclosing this personal information and I don't think it's a price I should have to pay for wanting to contribute to FOSS projects.