Create auto-merge bot
We currently have the problem that MRs made by upstreams are often stuck for weeks before they are noticed by someone among all the other MRs that actually need review. (recently happened with Tusky and K9 mail and often Nextcloud and soon Newpipe)
This happens when we can't auto-update the app because we can't parse the gradle file, it's a beta, or it does use reproducible builds.
I wouldn't really be comfortable with giving everyone push access to fdroiddata but a bot merging MRs by $user which only touches $app would be fine. The list we'd create for this also serves as a maintainer field (see #1407)
(side note: This could maybe be a solution for checkudpates as well, where checkupdates opens MRs instead of direct pushing and these would be merged automatically as long as lint passes and it only touches files with checkupdates configured.)