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I agree with the others that doing it on your phone is likely not realistic, but I wanted to point out that the f-droid machinery is open source, including (of course) the build descriptors, so I would suspect you can either setup your own GitLab pipelines to build pushes that you control, or -- with a little bit of elbow grease -- setup GitHub Actions that behave similarly. That story would be considerably easier if you're only tracking 3-4 apps (versus, say, 50 of them) since at that scale copy-pasta-deployment can be a perfectly reasonable approach
I'm not the OP, but every GitHub (and GitLab) releases page has a corresponding Atom feed for it: https://github.com/open-keychain/open-keychain/releases.atom allows tracking new releases using standard tooling