Add a workflow to trigger 'deploy-pages' in imcf.github.io

.github/workflows/dispatch-deploy-pages.yml

@@ -0,0 +1,31 @@
+name: 🚀 Dispatch workflows in other repositories
+
+on:
+  workflow_dispatch:
+
+  push:
+    branches:
+      - master
+    tags:
+      - "python-imcflibs-[0-9]+.*"
+
+jobs:
+
+  trigger-event:
+
+    strategy:
+      matrix:
+        repo: ['imcf/imcf.github.io']
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: 🏹 Fire event on `${{ matrix.repo }}`
+        run: |
+          curl -L \
+            -X POST \
+            -H "Accept: application/vnd.github+json" \
+            -H "Authorization: Bearer ${{ secrets.DISPATCH_DEPLOY_PAGES }}" \
+            -H "X-GitHub-Api-Version: 2022-11-28" \
+            https://api.github.com/repos/${{ matrix.repo }}/dispatches \
+            -d '{"event_type":"dispatch-event"}'