Add set_default_env and build_id to rbm default config
Related to tor-browser-build#40542, I think we can move var/set_default_env
from tor-browser-build/rbm.conf
to to rbm default config.
See tor-browser-build#40542 (comment 2818373) for a draft patch for this.
For var/build_id
, we will need to find a new name, since build_id
is already used for something else.