You will have to generate a Peertube image that includes Prosody in the same container that Peertube.I know this is not the standard way to do this with Docker, but keep in mind it is a temporary workaround.
But it may be removed in a near feature (to avoid drawbacks of this method).I have to discuss with Yunohost team, to decide how we can do to minimize drawbacks, and maximize compatibility.
Before updating to a major release, please read the release notes and breaking changes list : [CHANGELOG](https://github.com/JohnXLivingston/peertube-plugin-livechat/blob/main/CHANGELOG.md).
If you have just installed/upgraded the plugin, but nothing happens (no chat, no settings, buttons in the settings page does not work, ...), just try to reload the page.
If there is any error in the diagnostic page, you can search in this page for a solution, or refer to the [Bug tracking documentation page](/peertube-plugin-livechat/issues/) if you can't find any response.