Add codeberg to update mirrors

[maltfield]

Problem

Currently our in-app updates need to be able to access one of four websites:

1. repo.buskill.in
2. repo.michaelaltfield.net
3. github.com
4. gitlab.com

• buskill-app/src/packages/buskill/__init__.py

  Lines 57 to 62 in 53f631d

  	UPGRADE_MIRRORS = [
  	'https://raw.githubusercontent.com/BusKill/buskill-app/master/updates/v1/meta.json',
  	'https://gitlab.com/buskill/buskill-app/-/raw/master/updates/v1/meta.json',
  	'https://repo.buskill.in/buskill-app/v1/meta.json',
  	'https://repo.michaelaltfield.net/buskill-app/v1/meta.json',
  	]

If all 4 of those sites went down, BusKill wouldn't be able to update itself.

Note that the software verifies signatures, randomizes the domains in the mirror list, and automatically tries all the mirrors if it fails. So we don't actually have to trust the publishing infrastructure, and only one mirror needs to be reachable.

Solution

We can further make this more resilient by adding a new contender to the forge space: Codeberg

• https://codeberg.org/

How?

It's pretty simple to implement:

1. Copy the contents of gitlab to codeberg https://gitlab.com/buskill/buskill-app/
2. Update this repo's src/packages/buskill/__init__.py file to include the repo's raw download URL for the updates/v1/meta.json file
3. Update our documentation's Update updates repo metadat section to include updating this file on the codeberg repo https://docs.buskill.in/buskill-app/en/stable/software_dev/release.html#update-updates-repo-metadata