CI: use pmbootstrap v3
This changes the pmaports CI to use pmbootstrap, and is meant to replace !5344 (closed). (thanks @jane400 for exploring this initially!!)
fixes #3010 (closed)
TODO
-
stuff in .ci/lib needs to be migrated to pmb3 -
test, by pushing changes to this branch and letting CI changes in this branch deal with them
Edited by Administrator