Also, and that’s the annoying part, if you’re using HAOS and you install the agent inside the container, you’ll have to copy it there again on every restart of HA. Still need to try and put it somewhere in a directory that is mounted outside the container. You need to install the “Terminal & SSH” add-on in HA to be able to do this.
If you want to access the underlying OS, you’ll have to put it in debug mode acording to the instructions here:
You can then access the HAOS via SSH on port 22222.