add c6 compile test - testing

Author: gigapod

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

@@ -47,6 +47,13 @@ jobs:
               - name: esp32:esp32
                 source-url: https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_index.json
 
+          # ESP32-C6
+          # https://github.com/espressif/arduino-esp32/blob/master/boards.txt
+          - fqbn: esp32:esp32:esp32c6
+            platforms: |
+              - name: esp32:esp32
+                source-url: https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_index.json
+
           # Artemis / Apollo3  Feb 25 - there some issue here -- will need to look at 
           # https://github.com/sparkfun/Arduino_Apollo3/blob/main/boards.txt
         #   - fqbn: SparkFun:apollo3:sfe_artemis_atp