Onboarding does not work in Safari

[iBobik]

Describe the bug

When I start clean Space Cloud gateway and open UI in Safari it will not load.

Console:

[Error] Unhandled Promise Rejection: ReferenceError: Can't find variable: BroadcastChannel
promiseEmptyOnRejected (main.e1111d15.chunk.js:1:7186)
promiseReactionJob

Expected behaviour

UI will work in Safari

Actual behaviour

UI can not initialize

Steps to reproduce

1. Run Docker gateway by https://docs.space-cloud.io/install/docker/#installation
2. Open http://localhost:4122/mission-control/welcome
3. See endless "Welcome to Mission Control! Loading data…"

Your environment

• Space Cloud version: latest from Docker Hub
• Browser (if applicable): Safari 15.1 (Firefox works.)

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