Support for USB devices through Docker?

I have a docker container where my USB devices are accessible through the docker device option (--device /dev/bus/usb:/dev/bus/usb). The sispmctl application can then be used to control the powerstrip inside docker. This container is managed by our CI/CD system in a fairly standard setup.

However labgrid does not detect the powerstrip and so instead of using the intended driver SiSPMPowerDriver, my workaround is to create a custom ExternalPowerDriver.

What is the better approach? Is docker not intended to be supported the way I am using it?

sispmctl -s
Gembird #0
USB information: bus 002, device 014
device type: 4-socket SiS-PM
serial number: 01:01:3c:73:09

Output from labgrid-suggest:

labgrid-suggest
=== existing device ===
USBSerialPort for /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.7/2-1.7:1.0/ttyUSB0/tty/ttyUSB0
=== device properties ===
device node: /dev/ttyUSB0
=== no suggested matches found ===

=== existing device ===
USBNetworkInterface for /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.3/1-1.3:1.0/net/enxbc0f9a2b2ba9
=== no suggested matches found ===

=== existing device ===
USBPowerPort for /devices/pci0000:00/0000:00:1a.0/usb1/1-0:1.0
=== no suggested matches found ===

=== existing device ===
USBPowerPort for /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1:1.0
=== no suggested matches found ===

=== existing device ===
USBPowerPort for /devices/pci0000:00/0000:00:1c.2/0000:07:00.0/usb3/3-0:1.0
=== no suggested matches found ===

=== existing device ===
USBPowerPort for /devices/pci0000:00/0000:00:1c.2/0000:07:00.0/usb4/4-0:1.0
=== no suggested matches found ===

=== existing device ===
USBPowerPort for /devices/pci0000:00/0000:00:1d.0/usb2/2-0:1.0
=== no suggested matches found ===

=== existing device ===
USBPowerPort for /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1:1.0
=== no suggested matches found ===

Not working inside Docker:
env.yaml:
resources:
SiSPMPowerPort:
match:
ID_SERIAL: 'Gembird_EG-PMS2'
index: 1

driver:
  SiSPMPowerDriver: {}

Working inside Docker:
env.yaml:
ExternalPowerDriver:
cmd_on: 'sispmctl -o 1'
cmd_off: 'sispmctl -f 1'

Start with the env.yaml resource match and the labgrid-suggest output, then reproduce the SiSPMPowerDriver setup using Docker with /dev/bus/usb exposed. Compare it with the working ExternalPowerDriver configuration; done means the SiSPMPowerDriver detects and controls the Gembird powerstrip, or the Docker limitation and supported approach are documented.