Introduce a new "cache" subdirectory in the pmbootstrap workdir, all the
cache and config bits go in here, anything that needs to be accessible
from inside a chroot. The whole dir is then bind-mounted into the chroot
as /cache with appropriate symlinks.
This dir is in the config as config.cache.
In addition, all the cache_* and other config dirs are renamed to
be closer to the names of the equivalent dirs in the chroot (e.g.
abuild-config) and to avoid redundant naming since they are now under a
"cache" dir.
Signed-off-by: Casey Connolly <kcxt@postmarketos.org>
While this hypothetically could be triggered by a malicious server,
more likely is that this would be caused by a bug in pmbootstrap. As
such, soften the message a bit and also remove references to the removed
-m flag.
Fixes ebfda16d6d
Part-of: https://gitlab.postmarketos.org/postmarketOS/pmbootstrap/-/merge_requests/2635
[ci:skip-build]: already built successfully in CI
