Trigger Algolia search reindex on gh-pages built event and manually (#189)

* wip

* wip

* update trigger events

Author: ewgenius

.github/workflows/trigger_search_reindex.yml

@@ -0,0 +1,20 @@
+name: Trigger Algolia Search Reindex
+
+on:
+  workflow_dispatch:
+
+  # trigger automatically when gh-pages is built
+  page_build:
+
+jobs:
+  trigger:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Wait for gh-page cache update
+        if: github.event_name == 'page_build' && github.event.build.status == 'built'
+        run: sleep 60
+
+      - name: Trigger search reindex
+        run: |
+          curl -X POST "https://crawler.algolia.com/api/1/crawlers/${{ secrets.ALGOLIA_CRAWLER_ID }}/reindex" \
+            --user "${{ secrets.ALGOLIA_USER_ID }}":"${{ secrets.ALGOLIA_TOKEN }}"