Add update to purge command

purge.sh

@@ -10,6 +10,7 @@ for host in $@; do
     sudo apt purge -y ca-certificates-java fontconfig-config libjemalloc2 libpq5 python-psycopg2 python3-eventlet python3-greenlet python3-jinja2 python3-kazoo python3-markupsafe python3-pkg-resources python3-pygments python3-six uuid-runtime
     sudo apt autoremove --purge -y;
     sudo apt clean;
+    sudo apt update;
     sudo rm -rf /etc/pvc-install.* /etc/ceph* /etc/patroni* /etc/postgres* /etc/zookeeper* /etc/libvirt*;
     sudo rm -rf /var/lib/postgresql /var/lib/zookeeper /var/lib/libvirt;
     sudo rm -rf /run/ceph;