Add sparkfun_nrf52840_micromod to build.yml

Author: nitz

.github/workflows/build.yml

@@ -314,6 +314,7 @@ jobs:
         - "simmel"
         - "snekboard"
         - "sparkfun_lumidrive"
+        - "sparkfun_nrf52840_micromod"
         - "sparkfun_nrf52840_mini"
         - "sparkfun_qwiic_micro_no_flash"
         - "sparkfun_qwiic_micro_with_flash"