If anyone tries to do this on a Raspberry Pi 4, here’s how I got HA in a docker container to access my USB Bluetooth adapter
version: '3'
services:
homeassistant:
container_name: homeassistant
image: "ghcr.io/home-assistant/home-assistant:stable"
# The dbus volume is essential to make bluetooth work
volumes:
- /docker/ha/config:/config
- /etc/localtime:/etc/localtime:ro
- /run/dbus:/run/dbus:ro # Essential
environment:
TZ: Pacific/Auckland
restart: unless-stopped
# Setting privileged to true gives the container full access to all host devices including USB
# This is convenient but may not be ideal
# https://robertjandegroot.wordpress.com/2021/01/03/adding-usb-devices-to-your-containers/
privileged: true
network_mode: host