Explicitly use the `--mode` flag for the webapp development server
(`vite`) to make the web frontend choose the appropriate HTTP and
WebSocket port to communicate with the backend. This also makes sure
that when accessing the frontend via `https://`, the websocket
connection uses `wss://`.
As a side-effect, this also makes port `:8081` usable in production
environments; it would assume it was the development server and try to
access the backend on port `:8080`.
Reviewed-on: https://projects.blender.org/studio/flamenco/pulls/104296
Reviewed-by: Sybren A. Stüvel <sybren@blender.org>
ea68faa577