@nrwl/react-native:run-android could support active-arch-only flag

[ste7en]

• I'd be willing to implement this feature (contributing guide)

Description

This flag is suggested by the react-native team to speed up native build phases. This is due to the fact that, when building an Android app locally, it builds all the 4 supported ABIs (i.e. armeabi-v7a, arm64-v8a, x86 and x86_64. However when building and testing locally on an emulator or physical device we don't need all of them.

Motivation

This should reduce the native build time by a ~75% factor. (ref)

Suggested Implementation

Add an executor option flag (e.g. activeArchOnly) that passes the --active-arch-only argument to react-native CLI.

Alternate Implementations

Use the nx:run-commands executor with the command react-native run-android --active-arch-only.
For example my project.json looks like this:

"run-android": {
  "executor": "nx:run-commands",
  "options": {
    "command": "react-native run-android --active-arch-only",
    "cwd": "apps/my-mobile-app"
  }
}

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