make it very clear which machine will be used by the CI

.gitlab/ci_scripts/create_vps.sh

@@ -10,6 +10,7 @@ then
   # script exits with 0 (true) if the machine can be reused
   if python3 $(dirname "$0")/can_reuse_machine.py $HOSTNAME $ip_address
   then
+    echo "Will reuse machine with hostname '$HOSTNAME' and ip address '$ip_address'"
     exit 0
   fi
 fi