Converting a production upstream appliance into a development one

[Fryguy]

From discussion on SUI gitter room.

Since our upstream appliances are production mode, it would be nice to have directions for people to convert them to dev mode for rebuild purposes. For example, a user wants to change the skinning, but can't because we build the SUI with --production so the build bits are not there.

[Fryguy]

cc @simaishi, @jrafanie

[jrafanie]

ruby land bundler dependencies are required based on Rails environment but the INSTALLATION is controlled by the ENV['APPLIANCE'] variable see here

[simaishi]

There is RAILS_ENV=production set here which is used to compile OpsUI and yarn install --production for SUI as seen here