Haven't seen that error yet, but I'd suggest trying other Alpine mirrors (set them in your /etc/apk/repositories): https://mirrors.alpinelinux.org/
(there's also "apk fix" which helps when installing a package failed earlier for whatever reason, but that doesn't seem to be the cause here)
The bug gets tracked in https://gitlab.com/postmarketOS/pmaports/-/issues/2299, and a fix is being developed. Workarounds are mentioned in that issue. The download page has been updated to mention this and link to the issue in the meantime.
Is Alpine also becoming immutable, or is this development towards immutable independent/separate from Alpine?
It's a separate effort. 🙂
If you want the encrypted install on the eMMC, copy over the installation from the SD card (or image file if you don't use --sdcard) to the eMMC. Good luck!
Yes, through ondev2: https://fosdem.org/2023/schedule/event/ondev2_installer/ Still WIP at this point, but until then you should be able to make your own encrypted image with pmbootstrap install --fde --sdcard=... - see https://wiki.postmarketos.org/wiki/Pmbootstrap#SD_card
Sounds like not postmarketOS specific packages, but rather ones that would go into Alpine. You could make a packaging request here, and maybe someone wants to package it and maintain it for you if you are lucky: https://gitlab.alpinelinux.org/alpine/aports/-/issues/
Or you could try to build it yourself (and if you are willing to maintain it, then get that package into Alpine). Building Alpine packages is relatively easy: https://wiki.alpinelinux.org/wiki/Creating_an_Alpine_package
While I have not personally used any of them, I guess as long as they support standard wireguard or openvpn, they should work fine.
This looks really interesting, thanks for sharing!
For anyone wondering why this has a thumbnail, and the other episode does not:
https://gitlab.com/postmarketOS/cast.postmarketos.org/-/merge_requests/5
I'm surprised how many sites use that tag, this one line change surely was worth it :D
It isn't really convenient to do that at the moment, but here is a guide that involves some manual looking around in pmaports: https://wiki.postmarketos.org/wiki/Configure_postmarketOS_for_multiple_UIs_or_users