ci: sleep 3 before creating the db

.github/workflows/ci.yml

@@ -40,6 +40,7 @@ jobs:
     - name: Set up pg database
       run: |
         brew services start postgresql
+        sleep 3
         psql -U postgres -c 'create database customerdb;'
         psql -d customerdb -f examples/database/pg/mydb.sql
     - name: Test v->c