Add workflow_dispatch and self-trigger to deploy workflow

- Allow manual triggering via workflow_dispatch
- Trigger on changes to the workflow file itself

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.github/workflows/deploy-supabase.yml

@@ -1,12 +1,14 @@
 name: Deploy Supabase to Production
 
 on:
+  workflow_dispatch:
   push:
     branches:
       - master
     paths:
       - 'apps/supabase/**'
       - 'terraform/**'
+      - '.github/workflows/deploy-supabase.yml'
 
 jobs:
   deploy-database: