test: run tests on webkit

[achingbrain]

Adds a test:webkit script so we can run tests on webkit in CI.

[maschad]

So it seems there isn't parity across the Linux Webkit implementations on playwright which was causing these tests to fail on a linux vm for webkit. There is currently an open issue to add support for better testing WebRTC applications with Webkit but in the interim I suggest we run the webkit tests on a macOS instance until that's resolved.

[maschad]

So it seems there isn't parity across the Linux Webkit implementations on playwright which was causing these tests to fail on a linux vm for webkit. There is currently an open issue to add support for better testing WebRTC applications with Webkit but in the interim I suggest we run the webkit tests on a macOS instance until that's resolved.

Update: So I did some more research/testing and found that WebkitGTK (the full-featured port of the WebKit rendering engine on Linux-based OS's) does not yet support the PeerConnection API. Igalia is currently working on the implementation but this is obviously a blocker for Playwright supporting this interface.

Thanks to @MarcoPolo for pointing me in this direction.