reverse sleep in oracle CI tests

.github/workflows/oracle.yml

@@ -59,9 +59,6 @@ jobs:
           until  /tmp/oracle/instantclient_19_5/sqlplus -L -S sys/Oradoc_db1@//localhost:1521/orclpdb1.localdomain as sysdba @/tmp/user.sql ; do echo waiting for oracle; sleep 10; done;
           npm install oracledb --no-save
 
-      - name: Sleep
-        run: sleep 30
-
       - name: Test
         run: npm t
         env: