Build adafruithat & planktoscopehat variants of bookworm OS images

[ethanjli]

This PR makes progress on (or potentially resolves?) #325 by building adafruithat and planktoscopehat variants of the RPi OS 12 images. The resulting images still can only be used on the RPi 4 (because the hardware controller still relies on the RPi.GPIO Python library, which is incompatible with the RPi 5).

[ethanjli]

In basic testing (with an RPi connected to a camera but not connected to a PlanktoScope HAT) the adafruithat version of this OS image appears to work. Node-RED doesn't complain about anything, and the hardware controller successfully launches and pretends to move the pump without any complaints. The next step will be to test this on an RPi with actual PlanktoScope hardware.

[ethanjli]

I tested the latest planktoscopehat image from this PR on a PlanktoScope with the full v2.6 hardware. The camera worked, the LED control, and the pump worked.

I also tested the latest adafruithat image from this PR on an adafruithat-based PlanktoScope with a broken camera, and the LED control worked and the pump worked.

Based on these testing results, I think this PR is good enough to merge.