Compile sketches for Portenta M4 core in "Compile Examples" CI workflow

Some of the sketches are written to be compiled for the M7 core, some for the M4 core, and some for both. So the workflow
must be configured to provide for this.

Author: per1234

.github/workflows/compile-examples.yml

@@ -36,6 +36,17 @@ jobs:
       matrix:
         board:
           - fqbn: arduino:mbed_portenta:envie_m7
+            sketch-paths: |
+              - examples/BLE Connectivity on Portenta H7/PortentaBLE
+              - examples/Creating a Flash-Optimised Key-Value Store/FlashKeyValueStore
+              - examples/Dual Core Processing/BlinkRedLed
+              - examples/Dual Core Processing/BlinkRedLed_M7
+              - examples/Portenta H7 as a USB Host/LEDKeyboardController
+              - examples/Portenta H7 as a WiFi Access Point/SimpleWebServer
+              - examples/Setting Up Portenta H7 For Arduino/Blink
+          - fqbn: arduino:mbed_portenta:envie_m4
+            sketch-paths: |
+              - examples/Dual Core Processing/BlinkGreenLed_M4
 
     steps:
       - name: Checkout
@@ -53,8 +64,10 @@ jobs:
             - name: ArduinoBLE
             
           sketch-paths: |
-            - './examples/'
-            
+            # Sketches to compile for all boards
+            - examples/Dual Core Processing/BlinkBothCores
+            # Board-specific sketches
+            ${{ matrix.board.sketch-paths }}
           enable-deltas-report: true
           sketches-report-path: ${{ env.SKETCHES_REPORTS_PATH }}