Add a host alias for detached steps

[hhomar]

This allows detached steps to be referenced by other steps as per
services.

[marko-gacesa]

@hhomar what was the concrete example you needed this for? How would a user, use this ?

[bradrydzewski]

@marko-gacesa I think I understand this pull request. Currently we have the ability to define services and then communicate with those services using a hostname: https://docs.drone.io/pipeline/kubernetes/syntax/services/

this pull request look like it ensures this works for detached servers (services defined in the steps section). See https://docs.drone.io/pipeline/kubernetes/syntax/services/#detached-steps

[hhomar]

Hi. Sorry, I should have been more clear in the pull request, but you're exactly right.

This was how it worked when I was using the docker pipeline.

[mshebeko-twist]

Hi, do we have an estimate of this PR being merged?
Pipelines that worked with docker pipelines stopped working for me.

Another thing is - it's maybe easier to propagate step name to container name inside pod, this way kubernetes will know how to route packets between containers, and it will be much easier to debug pipeline from kubernetes as pod-name = step-name.

[tphoney]

thanks for the work @hhomar