extend timeout on health endpoint and cache result for 1 minute

docker/nginx/conf.d/client.conf

@@ -378,7 +378,11 @@ server {
 	location /skynet/health {
 		include /etc/nginx/conf.d/include/cors;
 
+		proxy_cache skynet;
+		proxy_cache_key $request_uri; # use whole request uri (uri + args) as cache key
+		proxy_cache_valid any 1m; # cache any response for 1 minute
 		proxy_set_header User-Agent: Sia-Agent;
+		proxy_read_timeout 5m; # extend the read timeout to 5 minutes
 		proxy_pass http://siad;
 	}