Testing in a clean container tests deploying in a clean container. For me, I run a computer :) Maven sounds like a nightmare tbh so I can understand that that specific piece of software has warts. That said, a good piece of package management software will be relatively agnostic to where its run and have a dependable set of behaviours. I much prefer that to a world where every bit of software is run on any conceivable combination of OS and hardware. What an absolute drain on brain space and creative effort!