fix(ci): Check if LED_BUILTIN exist

Author: P-R-O-C-H-Y

libraries/Zigbee/examples/Zigbee_Power_Outlet/Zigbee_Power_Outlet.ino

@@ -34,7 +34,13 @@
 
 /* Zigbee power outlet configuration */
 #define ZIGBEE_OUTLET_ENDPOINT 1
-uint8_t led = RGB_BUILTIN;
+
+#ifdef LED_BUILTIN // Use built-in LED if defined for the board
+uint8_t led = LED_BUILTIN;
+#else
+uint8_t led = 2; // Use custom LED pin
+#endif
+
 uint8_t button = BOOT_PIN;
 
 ZigbeePowerOutlet zbOutlet = ZigbeePowerOutlet(ZIGBEE_OUTLET_ENDPOINT);