Specify platform name

Author: per1234

.github/workflows/compile-examples.yml

@@ -72,7 +72,8 @@ jobs:
         uses: arduino/actions/libraries/compile-examples@master
         with:
           platforms: |
-            - source-url: https://github.com/arduino/ArduinoCore-samd/archive/master.zip
+            - name: arduino:samd
+              source-url: https://github.com/arduino/ArduinoCore-samd/archive/master.zip
           fqbn: ${{ matrix.board.fqbn }}
           libraries: "${{ env.UNIVERSAL_LIBRARIES }} ${{ matrix.libraries }}"
           sketch-paths: "${{ env.UNIVERSAL_SKETCH_PATHS }} ${{ matrix.sketch-paths }}"