Add action to trigger docs build

Author: MikeJohnPage

.github/workflows/trigger-deploy.yml

@@ -0,0 +1,26 @@
+name: Trigger blockr deploy
+
+on:
+  push:
+    branches: [main]
+
+jobs:
+  trigger:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Generate app token
+        id: app-token
+        uses: actions/create-github-app-token@v1
+        with:
+          app-id: ${{ secrets.APP_ID }}
+          private-key: ${{ secrets.APP_PRIVATE_KEY }}
+          owner: BristolMyersSquibb
+          repositories: blockr
+
+      - name: Dispatch to blockr
+        run: |
+          curl -X POST \
+            -H "Accept: application/vnd.github+json" \
+            -H "Authorization: Bearer ${{ steps.app-token.outputs.token }}" \
+            https://api.github.com/repos/BristolMyersSquibb/blockr/dispatches \
+            -d '{"event_type":"deploy-site"}'