have CI build RAK815

.github/workflows/main.yml

@@ -20,7 +20,7 @@ jobs:
           python -m pip install --upgrade pip
           pip install -U platformio
       - name: Install extra python tools
-        run: |          
+        run: |
           pip install -U adafruit-nrfutil
       - name: Build
-        run: platformio run -e tbeam -e heltec -e nrf52840dk -e feather_nrf52832
+        run: platformio run -e tbeam -e heltec -e nrf52840dk -e rak815