Ssh with full control to hassos image ( buildroot )

Hi, I am using Hass.io in Rpi3
it runs by docker and os is from official site(based on buildroot)

I want to use two HA instance in Rpi3.
Running another HA with ‘portainer add-on’ inside HA does not work well.

So I want to connect os via ssh, having a full control, run another HA docker image.

Is it right way to follow https://developers.home-assistant.io/docs/hassio_debugging?
Does that link tell how to get full control of os??

Thanks

You can’t do that with HassOS.
Why don’t you look at a generic-linux-install of Home Assistant Supervised? You can then run up other instances of whatever you want. Or use proxmox and set up VM’s. You’re probably not going to like the experience on a Pi though.
Or get a second RPi… they are cheap!

Thanks for your answer.
Actually I have many SBCs…(odroid, rpi, arduino…etc)…
I installed new Rasbian and HA docker…in Rpi3…it took 3days…
I would run another instance of HA, thanks