Enable SharedArrayBuffer to allow gallery view to work correctly when embedding Zoom meetings in an iframe. This can be done by sending specific headers or injecting a special script, as described in the Zoom documentation.
When embedding Zoom meetings in an iframe, I discovered that the gallery view does not work. It turns out that it requires enabling SharedArrayBuffer, and this must be done at the top level — i.e., on play.workadventu.re itself. This feature can be enabled by sending specific headers or by injecting a special script, as described [in the Zoom documentation](https://developers.zoom.us/docs/meeting-sdk/web/sharedarraybuffer/) This feature should be handled with care, as it may expose users to Spectre and Meltdown attacks. Tagging @moufmouf as we had a talk about it.