adding board to build.yml

Author: Seth Kerr

.github/workflows/build.yml

@@ -202,6 +202,7 @@ jobs:
         - "clue_nrf52840_express"
         - "cp32-m4"
         - "cp_sapling_m0"
+        - "cp_sapling_m0_revb"
         - "cp_sapling_m0_spiflash"
         - "datalore_ip_m4"
         - "datum_distance"