Upgrading/Redeploying a Heroku Imported App

I have a simple app that got ported over from Heroku. It’s been long enough that I don’t remember any of the details. The problem I’m having is that I’d like to update it, but I can’t even get it to build as-is:

Error: failed to fetch an image or build from source: app does not have a Dockerfile or buildpacks configured. See App configuration (fly.toml) · Fly Docs

The deets:

Clojure app (so Java)
Never have used Docker
There’s no storage (no DB, no files, nothing)
Simple HTTP server responding to two commands

I didn’t have a fly.toml but I found one in the app’s settings on Fly, so I copied that and got the above error running fly deploy. But there’s no build section in the TOML and none of the examples I can find have build sections either.

So I’m perplexed. How do I deploy changes?

Any help is appreciated!

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