chore(playwright): screenshots are now ignored locally (#25043)

.github/workflows/actions/update-reference-screenshots/action.yml

@@ -25,10 +25,16 @@ runs:
       # Configure user as Ionitron
       # and push only the changed .png snapshots
       # to the remote branch.
+      # Screenshots are in .gitignore
+      # to prevent local screenshots from getting
+      # pushed to Git. As a result, we need --force
+      # here so that CI generated screenshots can
+      # get added to git. Screenshot ground truths
+      # should only be added via this CI process.
       run: |
         git config user.name ionitron
         git config user.email hi@ionicframework.com
-        git add src/\*.png
+        git add src/\*.png --force
         git commit -m "chore(): add updated snapshots"
         git push
       shell: bash