Reinstate the ability to override the signalling server URL using the .env file for local testing

[dan-tw]

Relevant components:

• Scalable Pixel Streaming Frontend library
• Examples

Problem statement:

We had lost the ability to override the signalling server address for local testing

Solution

declare a WEBSOCKET_URL variable via the .env file that, if set, will be loaded in when running local dev testing and replace the signalling server URL builder functionality.

Documentation

Inside examples/typescript there is a .env.example file. Changing this to .env and changing the WEBSOCKET_URL to your custom websocket address will override the signalling server URL builder during testing

Test Plan and Compatibility

Tested locally and on cluster