Thanks for sharing this! It made it super easy to get up and running.
My app has run out of RAM once or twice (using a free 256MB VM), so I’ve allocated 256MB swap by adding swap_size_mb = 256 at the top level of the fly.toml file. It hasn’t been needed again yet, but should help with occasional spikes.
https://fly.io/docs/reference/configuration/#swap_size_mb-option