Debian extrepo support

[figuld]

From extrepo(1p):

The extrepo tool is used to manage external repositories in Debian. Before extrepo, users who wished to use software not packaged for Debian had to manually write the apt configuration files, run an unsigned script as root, or install an unsigned .deb package that contained all the configuration on their system. None of these methods were very secure.

Extrepo remedies this by way of a metadata repository for external package repositories. The user can search the list of metadata repositories by way of "extrepo search", and manage them through "extrepo enable", "extrepo disable", or "extrepo update".

Adding the repo to the official debian list (extrepo-data) should be easy, just need to create a pull request in their gitlab: https://salsa.debian.org/extrepo-team/extrepo-data/-/blob/master/README.md

[figuld]

@ChristopherHX also trixie directory should be added to the repo, it is the new debian stable

Update: Trying to use bookwork errors on trixie:

Solving dependencies... Error!  
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

Unsatisfied dependencies:
 mcpelauncher-manifest : Depends: libzip4 but it is not installable
 mcpelauncher-ui-manifest : Depends: libzip4 but it is not installable
 msa-manifest : Depends: libzip4 but it is not installable
Error: Unable to correct problems, you have held broken packages.
Error: The following information from --solver 3.0 may provide additional context:
   Unable to satisfy dependencies. Reached two conflicting decisions:
   1. mcpelauncher-manifest:amd64=1.5.3.18316929515.1~bookworm is selected for install
   2. mcpelauncher-manifest:amd64 Depends libzip4
      but none of the choices are installable:
      [no choices]

Same error on jammy