add board 4-H to builds

[ptorrone]

for circuitpython boards with different silk' on the board, let's add it as a build so it shows up on: https://circuitpython.org/downloads

4-h board info here (photos, etc):
https://www.adafruit.com/4h

[tannewt]

Closing in favor of #1673 which is one issue for the tooling and can include initial boards to do.