add mcnetwork install playbook

mcnetwork-install.yaml

+- hosts: wg
+  become: true
+  roles:
+    - wireguard
+  tasks:
+    - name: pull images
+      docker_image:
+        name: '{{item}}'
+        source: pull
+      with_items:
+        - git-registry.mycard.moe/railgun/gateways-monitor
+        - git-registry.mycard.moe/railgun/babeld
+        - git-registry.mycard.moe/nanahira/docker-ocserv
+        - git-registry.mycard.moe/railgun/openconnect
+    - name: debian packages
+      apt:
+        update_cache: true
+        name: netcat-openbsd,wireguard
+      when: ansible_os_family == 'Debian'
+    - name: wireguard directory
+      file:
+        name: /etc/wireguard
+        state: directory