You could consider using either scp with flyctl proxy or flyctl sftp to transfer files to your VM: How to copy data to a volume? - #2 by ignoramous
Transfer the sqlite db file (if there’s one already) or open a new sqlite db on the mount point of the volume you created.
How big is your sqlite db? Depending on how you intend to bootstrap your db, embedding the db file in the docker image might work nicely.