experiment with dispatch event for updates

Author: s-light

.github/workflows/dispatch-update.yml

@@ -0,0 +1,15 @@
+name: Dispatch Update Submodule
+on:
+  push:
+    branches:
+      - main
+jobs:
+  dispatch:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Dispatch update to mks-welcome
+        uses: peter-evans/repository-dispatch@v4
+        with:
+          token: ${{ secrets.PAT }}
+          repository: Make-Your-School/mks-welcome
+          event-type: update-submodule