Build medusa cli in docker files

[Dutchy-]

This PR adds support for using the medusa cli inside the docker containers.

Before:

$ docker run -it --rm --entrypoint medusa medusa-test
docker: Error response from daemon: OCI runtime create failed: container_linux.go:380: starting container process caused: exec: "medusa": executable file not found in $PATH: unknown.

After:

$ docker run -it --rm --entrypoint medusa medusa-test
Usage: medusa [OPTIONS] COMMAND [ARGS]...

Options:
 ( ... )

┆Issue is synchronized with this Jira Task by Unito
┆friendlyId: K8SSAND-1374
┆priority: Medium

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

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[Dutchy-]

I see 2 failing integration checks but as far as I can tell these are not related to my changes - I don't see anything related to the docker builds in the actions that have been run.

[adejanovski]

This is awesome @Dutchy- !!

Thanks a lot, I've been wanting this for a while now.