Create Billing

[ccremer]

Summary

Closes #522

Deployment notice

The ConfigMap config.json must be extended to provide a list of countries that should be selectable in the Billing form. It has the format countries: { code?: string; name: string }[]. For example, the list could look like this:

  "countries": [
    { "name": "Switzerland" }
  ],

(note: the country code isn't technically used yet, but may be of use in the future)

Checklist

• [x] Categorize the PR by setting a good title and adding one of the labels: bug, enhancement, documentation, change, breaking, as they show up in the changelog
• [x] Update tests.
• [x] Link this PR to related issues.

[ccremer]

The current country list is the following:

<snippet since irrelevant>

Please let me know if there are countries missing or excess

[ccremer]

@corvus-ch I believe this feature is now ready to be reviewed. Please note that the create permission is required for non-admins, which is currently missing in https://github.com/appuio/control-api/blob/1e86385a9df594547ca95fdeca40a9836f5d0122/config/user-rbac/basic-user-role.yml#L17-L22

[ccremer]

@corvus-ch I forgot to add the legal note. Now it's displayed when creating new billing address, let me know if the note is also required for editing existing billing.

[tobru]

let me know if the note is also required for editing existing billing.

It's only required for registering new billing addresses.

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