Use seperate preshared keys for each peer

tasks/network.yml

@@ -55,10 +55,16 @@
         src: 'files/wireguard/server.key',
         dest: '{{ vpn_server_key_path }}',
       }
-    - {
-        src: 'files/wireguard/preshared.key',
-        dest: '{{ vpn_preshared_path }}',
-      }
+
+- name: copy wireguard preshared keys
+  become: true
+  copy:
+    src: '{{ item.preshared_key_source_path }}'
+    dest: '{{ item.preshared_key_path }}'
+    owner: root
+    group: systemd-network
+    mode: '0640'
+  loop: '{{ vpn_peers }}'
 
 - name: restart systemd-networkd
   become: true