Add esp32 platform to compile examples github workflow

Author: pennam

.github/workflows/compile-examples.yml

@@ -56,6 +56,11 @@ jobs:
               - name: esp8266:esp8266
                 source-url: https://arduino.esp8266.com/stable/package_esp8266com_index.json
             libraries: ""
+          - fqbn: "esp32:esp32:esp32"
+            platforms: |
+              - name: esp32:esp32
+                source-url: https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_index.json
+            libraries: ""
 
     steps:
       - name: Checkout repository