Convert keys to lists

Author: sebromero

.github/workflows/compile-examples.yml

@@ -46,12 +46,14 @@ jobs:
             platforms: |
               - name: arduino:mbed_portenta
             artifact-name-suffix: arduino-mbed_portenta-envie_m7
-            additional-sketch-paths: examples/Standby_WakeFromRTC_C33
+            additional-sketch-paths: |
+              - examples/Standby_WakeFromRTC_C33
           - fqbn: arduino:renesas_portenta:portenta_c33
             platforms: |
               - name: arduino:renesas_portenta
             artifact-name-suffix: arduino-renesas_portenta-portenta_c33
-            additional-sketch-paths: examples/Standby_WakeFromRTC_H7
+            additional-sketch-paths: |
+              - examples/Standby_WakeFromRTC_H7
 
     steps:
       - name: Checkout repository