Configure the host address for rasa run actions

[bastbnl]

This is a copy of RasaHQ/rasa#8469, with the same idea.

I've been playing around with RASA open source edition on a classic vm, using a virtualenv for installation. I'm impressed.

I tried to figure out how to start RASA on a specific address instead of just localhost -- which appears to be every network interface and I was unable to find a way to configure the interface for rasa open source edition other than listing a port number at startup. I didn't find anything for the address. Inspecting the code learned me that starting rasa using rasa run -p 1531 will make the Sanic webserver listen on every interface using that specific port number.

The reason why I want to start RASA on a specific address is that I can limit access to the service by making RASA listen on a VPN interface, thus making it available to every machine on the VPN. I could probably archieve the same using a firewall and I may add one later on, but I figured being able to limit the netwerk interfaces would be a quick win.

[sara-tagger]

Thanks for submitting this feature request 🚀 @koaning will get back to you about it soon! ✨

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