ci: Identify SSH command container source by hostname
ci: Identify SSH command container source by hostname

We used the blueprint ID before. The hostname is much more
human-readable, and is functionally equivalent as it can also be used in
the `kelda ssh` and `kelda logs` commands.

kelda/kelda,kelda/kelda,LuiseV/quilt,LuiseV/quilt,LuiseV/quilt,NetSys/quilt,NetSys/quilt,kelda/kelda,NetSys/quilt,quilt/quilt,quilt/quilt,quilt/quilt,quilt/quilt,NetSys/quilt,NetSys/quilt,LuiseV/quilt,LuiseV/quilt,kelda/kelda