Allow configuration of bundler port via env or project level config

It appears as though right now the only way to change the metro bundler port is by manually starting the bundler, passing in a different setting and then manually changing it in the running app. Based on what I’m reading in the documentation, all this has to be done by hand. Per machine, per checkout, per emulator, per app install.

It goes without saying, but this is a considerable inconvenience.

For people using a local development environment, ports in the 808* range tend to be already allocated. We manage a local development environment and each service that we have in our stack is allocated a port according to a convention.

The current option for configuring the bundler port is insufficient. It needs to be configurable in such a way that I can either commit the configuration to source control, or maintain some value in my environment that gets passed during builds. Most importantly, it has to require zero manual steps so that someone checking out our projects for the first time has minimal to no manual gotchas.

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[atrauzzi]

Not stale.