Use caddy instead of socat for http proxying

roles/caddy_socket_proxy/templates/Caddyfile.j2

@@ -0,0 +1,12 @@
+# {{ ansible_managed }}
+{
+	servers {
+		trusted_proxies_unix
+	}
+}
+
+http:// {
+	bind fd/3
+	reverse_proxy {{ caddy_socket_proxy_service_name }}:{{ service_container_http_port }}
+}
+}