run a rust 'blinky' program on the raspberry pi pico (nixos)

Nice.

Here's another worked example of a less adventurous pi pico (W) project I did recently. It's C, built with Nix, and doesn't require setting up all the hardware-debugger stuff (it uses the much simpler hold-bootsel-while-plugging-in and copy-the-.uf2-file mechanism to load code). The 5th commit is the simple blink example from the SDK with all the build mechanisms figured out.