add health check

Author: ewdurbin

.cabotage/nginx.conf

@@ -25,6 +25,11 @@ http {
         listen unix:/var/run/cabotage/cabotage.sock;
         server_name _;
 
+        location = /_health/ {
+            access_log off;
+            return 200 "OK";
+        }
+
         location / {
             root /usr/share/nginx/html;
             index index.html;