* e2e: add end-to-end test workflow
- The tests are executed in a Docker container.
- The static users are connected via `matrix-js-sdk Client`.
- A test user connecting to the conference via EC.
* config: add feature in `config.json`
* groupCall: adjust connection state in feed if allowCallWithoutVideoAndAudio
* matrix-js-sdk: update version for allowCallWithoutVideoAndAudio
- I modified the SDK so that mute unmute work without media and check device permission inside the SDK
- allowCallWithoutVideoAndAudio is only checked at one point outside the SDK
* docu: add join group call without media docu in READMe
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Co-authored-by: Robin Townsend <robin@robin.town>
Co-authored-by: Šimon Brandner <simon.bra.ag@gmail.com>