Add report-size-delta action + step to upload artifact

Author: giulcioffi

.github/workflows/compile-examples.yml

@@ -255,5 +255,11 @@ jobs:
           sketch-paths: |
             ${{ env.UNIVERSAL_SKETCH_PATHS }}
             ${{ matrix.additional-sketch-paths }}
-          enable-deltas-report: 'false'
-          verbose: 'true'
+          enable-deltas-report: 'true'
+          verbose: 'true'
+
+      - name: Save memory usage change report as artifact
+        uses: actions/upload-artifact@v1
+        with:
+          name: size-deltas-reports
+          path: size-deltas-reports

.github/workflows/report-size-deltas.yml

@@ -0,0 +1,13 @@
+name: Report PR Size Deltas
+
+on:
+  schedule:
+    - cron:  '*/5 * * * *'
+
+jobs:
+  report:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Comment size deltas reports to PRs
+        uses: arduino/actions/libraries/report-size-deltas@master