sbuild, crossbuilds, and Mir [1/3]: sbuild setup

Hi all! I've been investigating sbuild for a crossbuild workflow for Mir. Accumulated some hacks, secret env variables, etc...and just want share the tips and tricks. In the end, this makes it possible to do reproducible full stack (mir, usc, qtmir [once cmake lands...]) cross-compiled mir builds

sbuilds, crossbuilds, and Mir [2/3]: sbuild optimizations

Hi! If you've followed along with the last email you have an sbuild that can build mir! However it probably takes quite some time (> 30 minutes). What can we do to reduce it? I have it down to 3 minutes on my system :D Vaguely ordered in terms of efficacy 1. apt-cacher-ng. Follow the steps on Sim