Correctly check hostname against PVE hosts

Some of the hostnames have `-` in instead, which caused issues with the SSH config detecting which users to allow

ansible/group_vars/all/base.yml

@@ -1 +1,4 @@
 TZ: Europe/London
+
+# HACK: Some of the hostnames aren't valid dict keys
+hostname_slug: "{{ ansible_hostname | replace('-', '_') }}"

ansible/group_vars/all/network.yml

@@ -1 +1 @@
-private_ip: "{{ nebula.clients[ansible_hostname].ip }}"
+private_ip: "{{ nebula.clients[hostname_slug].ip }}"

ansible/group_vars/all/pve.yml

@@ -9,7 +9,7 @@ pve_hosts:
     ip: 10.23.1.13
   jellyfin:
     ip: 10.23.1.101
-  pve_docker:
+  docker:
     ip: 10.23.1.103
   gitlab:
     ip: 10.23.1.106