Add dnsmasq so nginx will allow an upstream service to not block startup

conf/nginx/server-base.conf.jnj

@@ -81,7 +81,8 @@ location /secscan/ {
 
 {% if signing_enabled %}
 location ~ ^/v2/(.+)/_trust/tuf/(.*)$ {
-    proxy_pass {{ tuf_server }};
+  set $upstream_tuf {{ tuf_server }};
+  proxy_pass $upstream_tuf$uri;
 }
 {% endif %}