adb: more than one device/emulator

[MattSkala]

When running more instances of a runner and executing tests in parallel, the action fails while waiting for emulator to come online.

/Users/matt/Library/Android/sdk/platform-tools/adb shell getprop sys.boot_completed
  adb: more than one device/emulator
  The process '/Users/fitify/Library/Android/sdk/platform-tools/adb' failed with exit code 1

There should probably be -s argument to select the appropriate emulator to support cases when multiple emulators are running.

[mrk-han]

@MattSkala Thanks for the report! Would you mind sending us your .yml file, and show how you are sharding / parallelizing your tests?

I personally wouldn't try to run multiple emulators if using the standard GitHub runner infrastructure. But, perhaps if you are using a local or self-hosted runner than this could be useful to support.

If not for testing, can you iterate your use-case?

[mrk-han]

Duplicate of #193

[mrk-han]

@MattSkala Gonna close this because duplicate, but we can communicate on #193