Users need a way to see what host-side commands are available for a build image.

[rosieyohannan]

Currently once a build is run, there's no way to see what host-side commands were included at the time, this means that without the user 'remembering' running the desired command at deployment will be difficult.

Comment from old trello card:

Reco needs to be able to figure out which host commands are available based on state of disk. Needs to report those to platform. User needs to be able to view those for a build as part of reco build show-host-cmds or something. Stop a user running a sim using a host command that isn't on disk.

[pwaller]

I think this might be possible to do already since we just invoke commands that were passed, so in principle the user could run something like reco build run 'ls /path/to/where/the/bins/are'. We could standardise this.