Support --watch flag for vite:build

[jwnx]

It's a supported vite flag and would allow us to use vite the same way we use remix server, i.e: remix vite:build --watch + remix-serve ./build/server/index.js.

[csoylu]

I am using cloudflare d1 and in order to use the d1 database in local, and to have a similar architecture, i have to launch my remix app from wrangler.
Wrangler does not compile my application but only serves it and updates if the build files change.
I need in this case to be able to do a remix vite:build --watch followed by a wrangler pages dev