describe how to notify the material

Author: dvberkel

README.md

@@ -1,6 +1,16 @@
 # material
-Collecting all material necessary for the workshop
+Collecting all [material][] necessary for the workshop
 
 ## Usage
+The archive is created when this repository is notified of a change. It automatically builds the archive and publishes it as a package.
+
+### Notifying
+If one wishes to kick of a fresh build of the artifact one can use the GitHub action `notify-material` in this repository. Copy it to the `.github/workflows` directory of the notifying repository and customize the repository.
+
+The notifying repository should also have a `ACCESS_TOKEN` secret corresponding to the `user:personal_access_token` where the personal acces token has repo rights.
+
+## Manual
 Execute the `make` command. This creates a `material.tar.gz` that should be copied
 onto a thumb drive.
+
+[material]: https://github.com/boiding/material/releases/download/latest/material.tar.gz

notify-material.yaml

@@ -0,0 +1,15 @@
+name: Notify material
+on:
+  push:
+    branches:
+      - main
+jobs:
+  create-archive:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Notify material of change
+        run: >-
+          curl -X POST https://api.github.com/repos/boiding/material/dispatches
+          -H 'Accept: application/vnd.github.everest-preview+json'
+          -u '${{ secrets.ACCESS_TOKEN }}'
+          --data '{"event_type": "notification-of-change", "client_payload": { "repository": "node-starter" }}'