Support for cwd-less config

[kamal]

I would like to be able to share the JSON config with my other teammates. Some env variables and cwd are very much customized to my own machine. There are some configuration which I think are durable, like name, cmd. Currently, the only way to get everyone running a similar set up is to list the exact hotel command for each service.

[j-f1]

How about a .hotel.json sharable file with a cmd string, and an array of environment variable names? This could be stored in repos and added with hotel add .