In quickstart, the Ironic environment variables for bare metal lab are:
HTTP_PORT=6180
PROVISIONING_INTERFACE=eth0
CACHEURL=http://192.168.0.150
IRONIC_KERNEL_PARAMS=console=ttyS0
IRONIC_EXTERNAL_IP=192.168.1.7
IRONIC_EXTERNAL_CALLBACK_URL=https://192.168.0.150:6385
IRONIC_INSPECTOR_CALLBACK_ENDPOINT_OVERRIDE=https://192.168.0.150:5050
But IRONIC_INSPECTOR_CALLBACK_ENDPOINT_OVERRIDE does not seem to be used in ironic-image