Unreachable environment URLs are not set as External URL in new review environments

GitLab CI/CD
1

Hi,

When I dynamically create review environments like this:

reviewEnv:
  script:
    - env
    - exit 0
  environment:
    name: review/${CI_COMMIT_SHORT_SHA}
    url: https://${CI_COMMIT_SHORT_SHA}.hash.works

The created environment will not have the “External URL” set to $CI_ENVIRONMENT_URL, resulting in no buttons to jump to the new review deployment.

However, when I use a subdomain that actually exists and resolves this works just fine:

reviewEnv:
  script:
    - env
    - exit 0
  environment:
    name: review/${CI_COMMIT_SHORT_SHA}
    url: https://fb.hash.works

It seems that GitLab checks if the URL is actually reachable. My problems are that A) our GitLab server needs a webproxy to access external HTTP-Endpoints and B) its DNS server might not even resolve the used domain. The browsers of our developers however might reach that URL just fine.

How can I tell GitLab not to check if the environment URL is actually reachable?

Best Regards