Add step to save memory usage change

Author: giulcioffi

.github/workflows/compile-examples.yml

@@ -105,5 +105,12 @@ jobs:
             - source-path: "./"
               name: "arduino:megaavr"
           sketch-paths: "${{ env.UNIVERSAL_SKETCH_PATHS }} ${{ matrix.additional-sketch-paths }}"
-          enable-size-deltas-report: 'false'
-          verbose: 'true'
+          enable-size-deltas-report: 'true'
+          verbose: 'true'
+
+      - name: Save memory usage change report as artifact
+        if: github.event_name == 'pull_request'
+        uses: actions/upload-artifact@v1
+        with:
+          name: 'size-deltas-reports'
+          path: 'size-deltas-reports'