Add support for naming containers when deploying them

 When running several containers based on a single image on one host, it's useful to be able to name them.

For instance, when running four containers doing a processing job, it's nicer to have them named `backend1`, `backend2`, `backend3` and `backend4` instead of just having generated names.

Another example are images that can perform different tasks depending on configuration (like environment variables), so the containers could be named `backend-encoding`, `backend-multiplexing`, `backend-decoding` and so on.
Looks like the only line that would need to change per comment above is this one.