[apt] Use custom Proxmox mirror

Signed-off-by: Yohann D'ANELLO <ynerant@crans.org>

group_vars/virtu.yml

+---
+proxmox_mirror: http://mirror.adm.crans.org/proxmox/debian/pve

host_vars/gulp.cachan-adm.crans.org.yml

@@ -9,6 +9,7 @@ glob_ntp_client:
     - terenez.cachan-adm.crans.org
 
 debian_mirror: http://mirror.cachan-adm.crans.org/debian
+proxmox_mirror: http://mirror.cachan-adm.crans.org/proxmox/debian/pve
 
 loc_postgres:
   subnets:

roles/proxmox-apt-sources/templates/apt/sources.list.d/pve-enterprise.list.j2

 {{ ansible_header | comment }}
-deb     http://mirror.adm.crans.org/proxmox/debian/pve {{ ansible_lsb.codename }} pve-no-subscription
+deb     {{ proxmox_mirror }} {{ ansible_distribution_release }} pve-no-subscription