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The error doesn't appear anymore. Not sure why (cloudron updated to v8 meanwhile).
The errors remaining are "typical build image errors". Thanks for your support!
@jagan And I restarted the whole cloudron server and lo and behold, the app came back online. I was watching the logs, it sputtered and crackled, but in the end, came through. Thank you Cloudron for all this magic.
There is some related work here:
https://gitlab.com/romanrex19/madiator.com