fix: use pushd over cd

scripts/enable_ssl.sh

@@ -1,6 +1,7 @@
 #!/bin/bash
-cd /var/lib/postgresql/data
+pushd /var/lib/postgresql/data > /dev/null
 openssl req -new -newkey rsa:4096 -x509 -nodes -out server.crt -keyout server.key -batch
 chmod 600 server.key
 sed -i "s/^#ssl = off/ssl = on/" postgresql.conf
 sed -i "s/^#ssl_ciphers =.*/ssl_ciphers = 'AES256+EECDH:AES256+EDH'/" postgresql.conf
+popd > /dev/null