build: abbreviate bootstrap.urbit.org/ci artefact system name
build: abbreviate bootstrap.urbit.org/ci artefact system name

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