Includes all supported architectures:
* Android:
- arm (neon)
- arm64
- x86
- x64
* iOS:
- arm
- arm64
- x64 (simulator)
* Linux
- x86
- x64
* macOS
- x64
* windows
- x86
- x64
Use a single matrix for builds, then an extra step will package for
release.
Artefacts are generated for each platform/arch combination, along for
the 2 zip containing the full `webrtc` and `webrtc_debug` plugin.
