Add CI for Arduino Opta

Author: manchoz

Diff for: .github/workflows/compile-examples.yml

@@ -61,6 +61,9 @@ jobs:
           - fqbn: arduino:mbed_portenta:envie_m7
             platforms: |
               - name: arduino:mbed_portenta
+          - fqbn: arduino:mbed_opta:opta
+            platforms: |
+              - name: arduino:mbed_opta
 
     steps:
       - name: Checkout repository