Become root

[dominikl]

When running the playbook to create a rocky9 pilot, I got:

TASK [ome.nginx : Import a key for nginx] ******************************************************************************************************************************************
fatal: [2f5d1f82-2aad-433b-ab9f-98c5fe25ffa5]: FAILED! => {"changed": false, "msg": "error: can't create transaction lock on /var/lib/rpm/.rpm.lock (Permission denied)\nerror: /tmp/tmp31_1w5ho: key 1 import failed.\n"}

This PR fixes the issue.

Note: There's still the issue that selinux prevents nginx from serving omero.web. As a workaround I manually set SELINUX=disabled in /etc/selinux/config (and setenforce 0 in order to not have to reboot). Don't know how/if this could be added to the role. (now handled in ome/ansible-role-omero-web#50 )