Don't upload multiple times to same artifact in sketch compilation workflow

The "Compile Examples" GitHub Actions workflow is configured to compile the example sketches for each of the supported
boards. This is done by using a job matrix in the GitHub Actions workflow to generate a parallel job for each board.

A GitHub Actions workflow artifact is used to transfer the sketches report files generated by the
"arduino/compile-sketches" action between the compilation job and the "report-size-deltas" job that uses the
"arduino/report-size-deltas" action to publish the data. The "actions/upload-artifact" action is used to upload the
sketches report files to the workflow artifact.

Previously, the sketches reports from all the boards were uploaded to a single artifact. However, support for uploading
multiple times to a single artifact was dropped in version 4.0.0 of the "actions/upload-artifact" action. So it is now
necessary for each of the jobs to use a separate artifact.

These multiple artifacts are downloaded in aggregate in the "report-size-deltas" job by the "actions/download-artifact"
action, which downloads all artifacts by default.

Author: per1234

.github/workflows/compile-examples.yml

@@ -23,7 +23,6 @@ on:
 
 env:
   SKETCHES_REPORTS_PATH: sketches-reports
-  SKETCHES_REPORTS_ARTIFACT_NAME: sketches-reports
 
 jobs:
   build:
@@ -39,14 +38,23 @@ jobs:
       matrix:
         board:
           - fqbn: arduino:mbed_portenta:envie_m7
+            artifact-name-suffix: arduino-mbed_portenta-envie_m7
           - fqbn: arduino:mbed_nano:nanorp2040connect
+            artifact-name-suffix: arduino-mbed__nano-nanorp2040connect
           - fqbn: arduino:mbed_nicla:nicla_vision
+            artifact-name-suffix: arduino-mbed_nicla-nicla_vision
           - fqbn: arduino:mbed_nicla:nicla_sense
+            artifact-name-suffix: arduino-mbed_nicla-nicla_sense
           - fqbn: arduino:mbed_nano:nano33ble
+            artifact-name-suffix: arduino-mbed_nano-nano33ble
           - fqbn: arduino:renesas_portenta:portenta_c33
+            artifact-name-suffix: arduino-renesas_portenta-portenta_c33
           - fqbn: arduino:renesas_uno:unor4wifi
+            artifact-name-suffix: arduino-renesas_uno-unor4wifi
           - fqbn: arduino:samd:mkrwifi1010
+            artifact-name-suffix: arduino-samd-mkrwifi1010
           - fqbn: arduino:esp32:nano_nora
+            artifact-name-suffix: arduino-esp32-nano_nora
 
     steps:
       - name: Checkout repository
@@ -66,7 +74,7 @@ jobs:
         with:
           if-no-files-found: error
           path: ${{ env.SKETCHES_REPORTS_PATH }}
-          name: ${{ env.SKETCHES_REPORTS_ARTIFACT_NAME }}
+          name: sketches-report-${{ matrix.board.artifact-name-suffix }}
 
   report-size-deltas:
     needs: build
@@ -82,12 +90,11 @@ jobs:
         continue-on-error: true # If compilation failed for all boards then there are no artifacts
         uses: actions/download-artifact@v4
         with:
-          name: ${{ env.SKETCHES_REPORTS_ARTIFACT_NAME }}
           path: ${{ env.SKETCHES_REPORTS_PATH }}
 
       - name: Comment size deltas report to PR
         uses: arduino/report-size-deltas@v1
         # If actions/download-artifact failed, there are no artifacts to report from.
         if: steps.download-artifact.outcome == 'success'
         with:
-          sketches-reports-source: ${{ env.SKETCHES_REPORTS_PATH }}
+          sketches-reports-source: ${{ env.SKETCHES_REPORTS_PATH }}