Enable portable home/config dirs for extract-and-run

[xordspar0]

Backported from AppImage/AppImageKit#1247

[xordspar0]

The build fails on Alpine 3.17+ because zstd-static no longer exists; it was merged into zstd-dev. It's trivial to fix this and make both the chroot and qemu builds use Alpine 3.17, but maybe it's better to stick to an older release of Alpine in case musl built on a newer kernel starts depending on new kernel features?

[xordspar0]

maybe it's better to stick to an older release of Alpine

Hm, run-on-arch-action, used for the qemu build, only supports alpine_latest. And now that I've looked into how that action works, using a different distro version doesn't change which kernel you get anyway, since it's just a Docker container and qemu running in user mode. In that case I will update the build to work with Alpine 3.17 unless I can find a different way to cross compile with qemu.

[probonopd]

@TheAssassin lgtm; wdyt?

[xordspar0]

@probonopd, Does TheAssassin know to check for pull requests on this repo? It looks like he hasn't contributed to or reviewed PRs on type2-runtime before.

[probonopd]

I'd assume he is just busy with other things; in general he knows this repository :-)

[probonopd]

Friendly ping @TheAssassin - maybe you can have a look at this when you have some time (says the guy who hasn't enough time, most of the time).

[probonopd]

Ready for merging @TheAssassin?

[github-actions]

Build for testing:
artifacts
Use at your own risk.