build: add :soto, always install dependencies [ci skip]
build: add :soto, always install dependencies [ci skip]

Ensures that the JS associated with :soto is built when running `make
interface`.

Additionally, adding `npm install` as a mandatory step for all Landscape
builds goes some way towards resolving #1664, though it's not a complete
fix.

ngzax/urbit,jfranklin9000/urbit,jfranklin9000/urbit,jfranklin9000/urbit,jfranklin9000/urbit,ngzax/urbit,urbit/urbit,ngzax/urbit,urbit/urbit,jfranklin9000/urbit,urbit/urbit,jfranklin9000/urbit,jfranklin9000/urbit,urbit/urbit,ngzax/urbit,ngzax/urbit,ngzax/urbit,urbit/urbit,urbit/urbit,urbit/urbit,ngzax/urbit