Gitlab CICD Variable string interpolation

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Proposal

Please add ability for string variables to evaluate strings like below. This would be wonderful and reduce the amount of runtime, group or repo variables required.

CI_SERVER_HOST=gitlab.example.com

variables:
  SONARQUBE_URL: "https://sonarqube.${CI_SERVER_HOST//gitlab.}"

This would evaluate to https://sonarqube.example.com.

An alternative request if this is not possible is the creation of a new built-in variable CI_SERVER_DOMAIN, which would be: CI_SERVER_DOMAIN=example.com compared to CI_SERVER_HOST=gitlab.example.com
If the domain is just gitlab.com, then this CI_SERVER_DOMAIN variable would be just be "com".