Use YAML list for the compile-sketches sketch-paths input

Support for this format has been added since the workflow was written. This format makes the workflow easier to read and
maintain.

Author: per1234

.github/workflows/compile-examples.yml

@@ -24,7 +24,8 @@ jobs:
 
     env:
       # sketch paths to compile (recursive) compatible with all boards
-      UNIVERSAL_SKETCH_PATHS: '"libraries/Scheduler"'
+      UNIVERSAL_SKETCH_PATHS: |
+        - libraries/Scheduler
 
     strategy:
       fail-fast: false
@@ -39,13 +40,27 @@ jobs:
         include:
           - board:
               fqbn: arduino:mbed:nano33ble
-            additional-sketch-paths: '"libraries/PDM" "libraries/ThreadDebug"'
+            additional-sketch-paths: |
+              - libraries/PDM
+              - libraries/ThreadDebug
           - board:
               fqbn: arduino:mbed:envie_m4
-            additional-sketch-paths: '"libraries/doom" "libraries/KernelDebug" "libraries/Portenta_SDCARD" "libraries/Portenta_Video"'
+            additional-sketch-paths: |
+              - libraries/doom
+              - libraries/KernelDebug
+              - libraries/Portenta_SDCARD
+              - libraries/Portenta_Video
           - board:
               fqbn: arduino:mbed:envie_m7
-            additional-sketch-paths: '"libraries/doom" "libraries/KernelDebug" "libraries/Portenta_SDCARD" "libraries/Portenta_System" "libraries/Portenta_Video" "libraries/ThreadDebug" "libraries/USBHOST" "libraries/WiFi"'
+            additional-sketch-paths: |
+              - libraries/doom
+              - libraries/KernelDebug
+              - libraries/Portenta_SDCARD
+              - libraries/Portenta_System
+              - libraries/Portenta_Video
+              - libraries/ThreadDebug
+              - libraries/USBHOST
+              - libraries/WiFi
 
     steps:
       - name: Checkout repository
@@ -72,7 +87,9 @@ jobs:
             # Overwrite the Board Manager installation with the local platform
             - source-path: "./"
               name: "arduino:mbed"
-          sketch-paths: "${{ env.UNIVERSAL_SKETCH_PATHS }} ${{ matrix.additional-sketch-paths }}"
+          sketch-paths: |
+            ${{ env.UNIVERSAL_SKETCH_PATHS }}
+            ${{ matrix.additional-sketch-paths }}
           verbose: 'false'
           enable-size-deltas-report: true