Tweak the rtl_433.config.example to your liking and expose it to the container if you wish to override the default settings.
version: '3.2'
services:
thermopro_mqtt:
container_name: thermopro_mqtt
image: ghcr.io/aneisch/rtl_433_mqtt:latest
restart: 'no'
devices:
- '/dev/rtl_433:/dev/bus/usb/003/002'
volumes:
- '/opt/433_mqtt/rtl_433_config.example:/etc/rtl_433/rtl_433.conf'