add support for htpasswd auth

nginx.conf.template

@@ -5,9 +5,14 @@ server {
 
     client_max_body_size 100G;    
 
+    satisfy any;
+    
     # send all requests to the `/validate` endpoint for authorization
     auth_request /validate;
 
+    auth_basic           "goatbin";
+    auth_basic_user_file /etc/nginx/htpasswd;
+
     location = /validate {
       # forward the /validate request to Vouch Proxy
       proxy_pass http://@VOUCH_INTERNAL@/validate;