Update compile-sketches-rp2040.yml

Author: qqqlab

.github/workflows/compile-sketches-rp2040.yml

@@ -6,4 +6,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: arduino/compile-sketches@v1
         with:
-          fqbn: rp2040:rp2040:pico
+          platforms: |
+            - name: rp2040:rp2040
+              source-url: https://github.com/earlephilhower/arduino-pico/releases/download/global/package_rp2040_index.json
+          fqbn: rp2040:rp2040:rpipico