Don't compile ROOT_URL/etc into Next bundle (use window variable)

[benjie]

Otherwise we can't easily promote staging to production (requires rebuild)

[aortbals]

Hey @benjie - I've made this change locally to a project and also modified the production Dockerfile to support building a single image for multiple environments and multiple entry points (server, worker). This means you can build and store one image that can be promoted and also used for either the server or worker. Would you be interested in a PR?

[benjie]

Yes please 🙌

[benjie]

Hey @aortbals have you had a change to look at this yet?

[aortbals]

I'll get a PR up this week, thanks for the reminder!

[benjie]

Awesome 👍

[DylanVann]

I thought I could work on this after refactoring environment variables (#234), but it seems like it's already done in @app/client/src/next.config.js.

[benjie]

Ah yes, I did this, thanks 👍