add --external option to open

[effron]

Allow user to use a configured external domain when calling $ powder open.

powder open currently defaults to the first configured POW_DOMAIN, but there is no way to open a configured POW_EXT_DOMAIN besides xip.io. This allows a user to configure a different external domain (e.g., one that always resolves to 127.0.0.1), and open the application using powder.

for example, you can add

export POW_EXT_DOMAINS=vcap.me,xip.io

to your .powconfig, then call $ powder open -e to open your app to my_cool_app.vcap.me.

[zzma]

I have a similar use case and have been hoping this sort of feature would be added :exclamation:

[mitsuru]

+1

[zzma]

any update on this? @rodreegez