add adafruit boards to ci build

.github/workflows/build.yml

@@ -161,6 +161,9 @@ jobs:
       matrix:
         board:
         # Alphabetical order
+        - 'adafruit_feather_esp32s2'
+        - 'adafruit_magtag_29gray'
+        - 'adafruit_metro_esp32s2'
         - 'espressif_kaluga_1'
         - 'espressif_saola_1'