Give gromit access to the archmanweb server

In the context of the bugmigration the navbar of this service has to be redeployed for which I request access to this service.

related to: !776 (closed)

group_vars/all/root_access.yml

@@ -26,6 +26,7 @@ root_ssh_keys:
     hosts:
       - bugs.archlinux.org
       - wiki.archlinux.org
+      - man.archlinux.org
 
 # - run 'playbooks/tasks/reencrypt-vault-{super,default}-key.yml' when this
 #   changes; before doing so, make sure to 'gpg --lsign-key' all listed keys