AKMS builds modules in a sandbox using bubblewrap. Bubblewrap
unfortunately does not work in chroot environment, thus breaking
pmbootstrap. While a PR has been proposed upstream, history shows that
upstream takes a while to consider PRs. Thus, to unblock usage of AKMS,
this adds a patched version that allows disabling of sandbox using
`--no-sandbox` argument or by adding `use_sandbox=false` to
`/etc/akms.conf`. When building in chroot environment, sandboxing is
automatically disabled.
The aport handles conflicts with akms by setting `pkgver=9999$_pkgver`,
thus always overriding Alpine's package.
Upstream PR: https://github.com/jirutka/akms/pull/19
Part-of: https://gitlab.postmarketos.org/postmarketOS/pmaports/-/merge_requests/6604
