Add test for IPv6

Author: HeMan

.github/workflows/push.yml

@@ -23,3 +23,7 @@ jobs:
           arduino-cli --config-file arduino-cli.yaml core install esp32:[email protected]
       - name: Compile Sketch
         run: arduino-cli --config-file arduino-cli.yaml --library ./src/ compile --fqbn esp32:esp32:esp32 ./examples/ClientServer/Client/Client.ino
+      - name: Compile Sketch with IPv6
+        env:
+          LWIP_IPV6: true
+        run: arduino-cli --config-file arduino-cli.yaml --library ./src/ compile --fqbn esp32:esp32:esp32 ./examples/ClientServer/Client/Client.ino