Allow template variables to be used in dynamic environments name and url

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Currently an environment can be created dynamically using some variables, quoting the doc:

Allowed variables

The name and url keywords for dynamic environments can use most available CI/CD variables, including:

    Predefined environment variables
    Project and group variables
    .gitlab-ci.yml variables 

Which looks to forbid using variables from templates, making this fail (silently: i see no error, but the env is not created, probably due to the invalid '$' character in it?):

.staging:
  stage: staging
  environment:
    name: $subdomain
    url: https://$subdomain.example.com
deploy master to staging:
  extends: .staging
  only:
    - master
  variables:
    subdomain: ${STAGING_SUBDOMAIN}

deploy branch to staging:
  extends: .staging
  except:
    - master
  variables:
    subdomain: ${CI_COMMIT_REF_SLUG}-${STAGING_SUBDOMAIN}

I tried by templating it myself, and it worked, so it really looks related to a template variable issue.