Automatically generate and post "announcements" to matrix #3511
Description
This has been attempted in #2255 and #2593, but has stalled because those PRs do too much at once and are too difficult to review.
#3510 adds the first step needed: the ability to compare nixvim's set of plugins with another revision of nixvim.
- diff plugins with another revision
flake: add diff-plugins command #3510 - generate a plugin announcement for a specific plugin
- post announcements to the PR and/or workflow summary
- post announcements to matrix
Posting to matrix will require using a GH Action and supplying it a user token.
Previous attempts used the https://github.com/lkiesow/matrix-notification action, which documents how to create a token here.
A while ago I created a nixvim-bot matrix user (hopefully I still have the login details), so we should be able to generate a token and add it to the repo.