Align service name and hostname

With Podman, Docker compose does not expose the service hostname to DNS, only the service name. The release Jenkins is thus exposed as 'jenkins-releasing' while scap refers to it as 'jenkins-rel'. It is thus unrechable.

I have tried to find the root cause in the stack but haven't found any good lead between Docker compose and Podman. Changing the service name to match the hostname jenkins-rel is a quicker fix.