`fly launch` no longer generates a Dockerfile for Astro 5 sites

[timothymalcham]

Tried to launch and deploy a brand new Astro project using version 5.16.10, using the minimal, recommended template they provide via npm create astro@latest. It creates a fly.toml, but no Dockerfile.

➜ fly launch
Scanning source code
Could not find a Dockerfile, nor detect a runtime or framework from source code. Continuing with a blank app.

I tried using npx --yes @flydotio/dockerfile@latest to generate one, but the resulting Dockerfile doesn't work without modifications. Running fly deploy using that generated Dockerfile results in an app that can't run, I get this:

 WARNING The app is listening on the incorrect address and will not be reachable by fly-proxy.
You can fix this by configuring your app to listen on the following addresses:
  - 0.0.0.0:8080

It's not a major hurdle to get this working right, but thought I might flag this.

• Operating system
• fly version

fly v0.4.3 darwin/arm64 Commit: f58ce93 BuildDate: 2026-01-12T23:32:09Z