Fix regression: report size delta size on PR. (#65)

The necessary steps have in fact been documented here: https://github.com/arduino/report-size-deltas/blob/main/docs/FAQ.md#workflow-triggered-by-pull_request-event but I have overlooked them when I fixed the upload issue. With this PR the size deltas are - once again - reported within the PR.

Author: aentinger

.github/workflows/compile-examples.yml

@@ -18,14 +18,14 @@ on:
   workflow_dispatch:
   repository_dispatch:
 
+env:
+  SKETCHES_REPORTS_PATH: sketches-reports
+
 jobs:
-  build:
+  compile:
     name: ${{ matrix.board.fqbn }}
     runs-on: ubuntu-latest
 
-    env:
-      SKETCHES_REPORTS_PATH: sketches-reports
-
     strategy:
       fail-fast: false
 
@@ -135,3 +135,18 @@ jobs:
           if-no-files-found: error
           path: ${{ env.SKETCHES_REPORTS_PATH }}
           name: sketches-report-${{ matrix.board.artifact-name-suffix }}
+
+  report:
+    needs: compile
+    if: github.event_name == 'pull_request'
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Download sketches reports artifacts
+        uses: actions/download-artifact@v4
+        with:
+          path: ${{ env.SKETCHES_REPORTS_PATH }}
+
+      - uses: arduino/report-size-deltas@v1
+        with:
+          sketches-reports-source: ${{ env.SKETCHES_REPORTS_PATH }}