Gatekeeper rule: Certificate CN character limit

[sj-williams]

Background

When creating a Certificate resource for custom domains, the Common Name field has a limit of 64 characters. This requires the workaround as described in the user guide here

Create an OPA rule that checks that the first common name entry in dnsNames: is no greater than 64 characters, so that the problem can be highlighted to users.

Which part of the user docs does this impact

https://user-guide.cloud-platform.service.justice.gov.uk/documentation/other-topics/custom-domain-cert.html#using-a-custom-domain

• [ ] post for #cloud-platform-update
• [ ] Weeknotes item
• [ ] Show the Thing/P&A All Hands/User CoP
• [ ] Announcements channel

Questions / Assumptions

Definition of done

• [ ] readme has been updated
• [ ] user docs have been updated
• [ ] another team member has reviewed
• [ ] smoke tests are green
• [ ] prepare demo for the team

Reference

How to write good user stories