Add missing environment variables to .env.example

Author: i-am-that-guy

.env.example

@@ -4,3 +4,13 @@ DATABASE_URL=
 
 # Direct connection to the database. Used for migrations
 DIRECT_URL=
+
+# Supabase URL
+SUPABASE_URL=
+
+# Supabase service role key
+SUPABASE_SERVICE_ROLE_KEY=
+
+# Environment variables for the application
+NODE_ENV=development
+