added ceph-pacific (16.x) to proxmox hypervisor

roles/proxmox-apt-sources/tasks/main.yml

 ---
 - name: Configure Proxmox repositories
   template:
-    src: apt/sources.list.d/pve-enterprise.list.j2
-    dest: /etc/apt/sources.list.d/pve-enterprise.list
+    src: "apt/sources.list.d/{{ item }}.list.j2"
+    dest: "/etc/apt/sources.list.d/{{ item }}.list"
+  loop:
+    - pve-enterprise
+    - ceph

roles/proxmox-apt-sources/templates/apt/sources.list.d/ceph.list.j2

+{{ ansible_header | comment }}
+deb	{{ ceph_mirror }} {{ ansible_distribution_release }} main