add workflow_dispatch event

Co-authored-by: Aviv Keller <me@aviv.sh>
Signed-off-by: Dario Piotrowicz <dario.piotrowicz@gmail.com>

Author: dario-piotrowicz

.github/workflows/tmp-cloudflare-open-next-deploy.yml

@@ -11,6 +11,7 @@
 name: Deploy the Cloudflare OpenNext test version of the site (https://node-test.org)
 
 on:
+  workflow_dispatch:
   push:
     branches:
       - main