add new board to CI

Author: jepler

.github/workflows/build.yml

@@ -208,6 +208,7 @@ jobs:
         - "feather_m0_rfm69"
         - "feather_m0_rfm9x"
         - "feather_m0_supersized"
+        - "feather_m4_can"
         - "feather_m4_express"
         - "feather_m7_1011"
         - "feather_mimxrt1011"