Publish the AppConfig JSON schema

[smorimoto]

It’s always useful to have the AppConfig JSON schema based on the latest build when developing with VSCode, etc.

For example, Vercel and others expose it with the following endpoint:

• https://openapi.vercel.sh/vercel.json
• https://turbo.build/schema.json

For Fly.io it would be:

• https://fly.io/schema.json

[smorimoto]

There’s already a related topic, and more than a few people are either interested in it or have given up.

TOML schema in recommended vscode extension is outdated

Hi, the App Configuration docs recommend the vscode extension Even Better TOML, but unfortunately its manually maintained JSON schema is heavily outdated. Would it be feasible to generate a schema from the config structs in flyctl and submit a PR to the extension’s repo? I filed an issue there as well with more details, but I have no experience whatsoever with Go: fly.io schema is outdated · Issue #398 · tamasfe/taplo · GitHub

For VSCode, just update the URL and everything should be fine: https://github.com/tamasfe/taplo/blob/42bce0c6a753a394ca40263660a889165c2762e5/site/site/public/schema_index.json#L12-L20