OpenWRT docker installation not going as planned

I am trying to install HA with docker on my TP-Link Archer C2600 OpenWrt 23.05.2 on a 64GB USB 2.0 drive,
I am less experienced and not being able to do it properly by myself.
I think I was almost there but then messed up with my .yml file?

the docker-compose.yml looked like this:

root@OpenWrt:/overlay/etc/homeassistant# vi docker-compose.yml
version: '3'
services:
  homeassistant:
    container_name: homeassistant
    image: "ghcr.io/home-assistant/home-assistant:stable"
    volumes:
      - /opt/homeassistant/config:/config
      - /etc/localtime:/etc/localtime:ro
    restart: unless-stopped
    privileged: true
    network_mode: host

I wanted it to be installed on my 64GB USB drive /overlay/etc/homeassistant.
I am not to sure where it is at the moment.
But the used space on my memory stick increased to 2GB.

root@OpenWrt:/opt/homeassistant/config# 

exists but has no data.
not sure where /opt/ is located in the file system, if that is actually on sdb1 or in overlay or where?
It shows nothing in sdb1

It has installed an Interface with the name docker which states:

Protocol: Unmanaged
RX: 0 B (0 Pkts.)
TX: 0 B (0 Pkts.)
Information: Not started on boot
Error: Network device is not present