Lemmy Schedule

I've added a new experimental feature to Lemmy Schedule, currently only available if you're self-hosting and enable the feature using the FLAG_COMMUNITY_GROUPS environment variable (set it to 1 or something).

Community groups allow you to define a group of communities which then can be a target when creating a post. Meaning you can create a group that consists for example of 5 different "world news" communities and then you don't have to remember which ones you usually post to, you just post to the group and it will get resolved to actual community names automatically.

The feature will be available on https://schedule.lemmings.world once I finish it, currently it's not very polished (error handling needs some work, other than that it should work well).