feat(pre-commit): check for author e-mail domain to match @weahead.se

[michaellopez]

This PR adds a check to pre-commit phase to check that the domain for the commit authors e-mail address matches @weahead.se

There have been too many occurrences of devs commiting with their non-weahead e-mail addresses. This should help mitigate that going forward. After this is merged and published we should go over each repository and rewrite all the commits author e-mails to be their @weahead.se counterparts.

Some things to discuss before merge:

• Should the error message be more "urgent" (red, bold, something else)? See screenshot
• First pass of the error message I included the "replace Your Name with your real name" part, but I think that your developers should be smart enough to get that without that explanation, right?
• Is the error message good enough?

[lofgrenfredrik]

Nice addition!

• Yes I think some form of highlight would be nice to emphasise the error message. Maybe just bolding it would be enough?

• Yes I don't think that extra part would be necessary.

• I think it's good enough, if not we can always update and tweak it as necessary.

[michaellopez]

Don't forget that we need to handle the case of external collaborators that need to commit to the repos.

[lofgrenfredrik]

@michaellopez
@linusklingzell had a good point regarding this.
Since our packages and configs are open to all we might want to make the email check toggleable? or in some other way optional.

[lofgrenfredrik]

@michaellopez
Maybe we can use the config key in package.json where you add an array of email domains you want to allow commits from?
Or have it create a config file where you add the email domains, specific emails or if we can use some form of glob pattern?
That way it's not locked to just weahead and it's easy to add emails for external collaborators.

[michaellopez]

@lofgrenfredrik Yes, that sounds like a good plan. Let's try it