Allow external access to containers running in Pipelines via a custom subdomain

I want to use SauceLabs to test my product that runs across multiple Atlassian server products.

The Docker images have a hostname like

<baseurl>http://724babeb-d690-452c-aa9b-ef5660af34ae:5990/product</baseurl>

But that's not a URL available external to the container.

I would like to see something like

<baseurl>http://724babeb-d690-452c-aa9b-ef5660af34ae.pipelines.bitbucket.org:5990/product</baseurl>

So that external testing tools like Sauce Labs can access the running containers.

https://bitbucket.org/eddiewebb/statuspage-banner-atlassian-server/addon/pipelines/home#!/results/%7Bba811533-a428-4238-b66c-12bb6497909c%7D