Blacklisted email domains should block the registration process

Closes #1059 (closed)

What does this MR do?

Blacklisted email domains should block the registration process

How confident are you it won't break things if deployed?

I wrote a functional test, so I guess it should be fine

Links to related issues

• https://yunity.slack.com/archives/C1T1ZM9A4/p1635581132011000
• https://yunity.slack.com/archives/C1T1ZM9A4/p1636395293062900

How to test

I am on page: https://foodsharing.de/ I click the button "Mitmachen' I click 'Jetzt registrieren!' I fill Field '#email' with an email address with a blacklisted domain I fill Field '#password' with some valid password I fill Field '#confirmPassword' with some valid password I click 'weiter'

Then I should see 'Die E-Mail-Adresse ist ungültig.' and not get to the next page

Screenshots (if applicable)

Checklist

• added a test, or explain why one is not needed/possible...
• no unrelated changes
• asked someone for a code review
• set a "for:" label to indicate who will be affected by this change
• used "state:" labels to track this MR's state until it was beta tested
• added to the next milestone (see https://gitlab.com/foodsharing-dev/foodsharing/-/milestones, unless it has a "for:Dev" label)
• added an entry to CHANGELOG.md
• added a short text that can be used in the release notes
• Once your MR has been merged, you are responsible to create a testing issue in the Beta Testing forum: https://foodsharing.de/?page=bezirk&bid=734&sub=forum. Please change the MRs label to "state:Beta testing".
  • Consider writing a detailed description in German.
  • Describe in a few sentences, what should be tested from a user perspective.
  • Also mention different settings (e.g. different browsers, roles, ...) how this change can be tested.
  • Be aware, that also non technical people should understand.

Release notes text in German

When using a blacklisted email domain the registration process is blocked.