roles/dch-proxy: Add haproxy config for Bitwarden

This commit adds an HAProxy backend for Bitwarden, and adds ACL rules to
the frontend to proxy traffic to *bitwarden.pyrocufflink.blue* or
*bitwarden.pyrocufflink.net* to it.

roles/dch-proxy/tasks/main.yml

@@ -19,6 +19,13 @@
     mode=0644
   notify: reload haproxy
 
+- name: ensure bitwarden haproxy backend is configured
+  template:
+    src=backend-bitwarden.haproxy.cfg.j2
+    dest=/etc/haproxy/70-backend-bitwarden.cfg
+    mode=0644
+  notify: reload haproxy
+
 - name: ensure openvpn haproxy backend is configured
   template:
     src=backend-openvpn.haproxy.cfg.j2