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Ironically the only auto reply bot app for Signal I found is closed source ...
(www.getdroidtips.com)
Well, it might be kind of overkill, but basically you could use matrix to bridge to signal and then use a bot to do automatic answers.
The matrix ansible docker deploy playbook would be able to install everything you'd need for that:
- synapse, the matrix server
- mautrix-signal, the bridge to signal
- maubot, which you could configure to do auto replies
All of those components are open source.