Configurable Build Options

[unibeck]

Currently when you run nuxthub deploy it ends up running nuxi build --preset=cloudflare-pages. It would be helpful to be able to pass other nuxi build options such as --dotenv .dev.vars to the build command when running nuxthub deploy.

A couple of ideas on implementation:

1. Use nuxt.config.js hub option

hub: {
  extraBuildOpts: ['--dotenv .dev.vars']
},

2. Allow pass through from nuxthub cli
   nuxthub deploy --dotenv .preview.vars

[atinux]

Related to #5