Will try this soon but posting here for a sanity-check if this will work with your package:
Might need some details for the Cloudron container DB connection?
/app/data/custom.iniis where the users customizations go. What db were you using in your existing installation? The cloudron package uses postgres. To get the DB connection credentials, you can go to the Terminal of the app and do
env | grep CLOUDRON_POSTGRES. You can also click the postgres button on the top and it will paste the CLI needed to access postgres.