adapt to Rails 7.0 defaults

[craisp]

Since 7.0, Rails protects against redirecting to external hosts https://api.rubyonrails.org/classes/ActionController/Redirecting.html#method-i-redirect_to-label-Open+Redirect+protection This change adapts to this by adding the option allow_other_host to the method call

[olimart]

@joshbuker can you allow to run CI please

[joshbuker]

No idea why CI is borked, ~~going to merge main and kick that off again.~~ it's already up-to-date, and I can't force push.

Guess I'll test locally.