Allow ngrok configuration to be passed in

[dsmwong]

Hi,

It would be good to be able to add additional options to allow ngrok configuration to be passed in. The following use cases for --ngrok action

1. pass in subdomain into ngrok so it generate a consistent URI for ngrok
2. pass in user specified configuration file instead of using ~/.ngrok2/ngrok.yml for configration. This will allow project specific ngrok configuration to be set.

[welcome]

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[dsmwong]

Apologies - wrong project. moving to serverless plugin.

[philnash]

Actually I think this is where most of the implementation would go. @twilio-labs/plugin-serverless#38 will be needed so that the Serverless Plugin gets the options added.

[philnash]

Hey @dsmwong, just took a look at this. Two bits of good news:

1. You can already pass in a subdomain to the ngrok command, there's no separate option, you just pass it with --ngrok like so:

   $ twilio serverless:start --ngrok=subdomain
   or
   $ npx twilio-run --ngrok=subdomain
   

2. I've just opened a PR to implement custom config and named tunnels. I'd appreciate feedback on that, if you have time.