Kasm Workspace has a Redroid image that lets you use Android in a web browser along with any of the other images Kasm has in their registry. There are some caveats in the installation that are explained in the docs. YMMV depending on your knowledge levels.

Alternatively, figure out how to install Redroid directly. https://github.com/remote-android/redroid-doc Keep in mind, you will either want to run this on a baremetal install of one of the supported distros listed or a full VM. It will want Binderfs, and that’s a pain in the ass to install on an LXC container if that’s what you’re using as a docker host.