Changed APT proxy in skyreach Nginx conf (refs #20417).

2.Common_services/5.Nginx/vhost_skyreach.conf

+proxy_cache_path /tmp/nginx-uc-apt-cache levels=1:2 keys_zone=uc-apt-cache:10m max_size=4g inactive=300s;
+
 server {
 	listen 80;
 	server_name {{ server_name }};
@@ -38,14 +40,33 @@ server {
 		include /etc/nginx/uwsgi_params;
 	}
 
-	# Ubuntu
+	# Old APT proxy urls
 	location /fr.archive.ubuntu.com/ubuntu {
-		proxy_pass http://127.0.0.1:3142;
+		rewrite ^/(.*)$ /apt/http/$1?;
 	}
 	location /security.ubuntu.com/ubuntu {
-		proxy_pass http://127.0.0.1:3142;
+		rewrite ^/(.*)$ /apt/http/$1?;
 	}
 	location /old-releases.ubuntu.com/ubuntu {
-		proxy_pass  http://127.0.0.1:3142;
+		rewrite ^/(.*)$ /apt/http/$1?;
+	}
+	# APT proxy
+	location /apt {
+		location ~ ^/apt/(http|https)/([\w\.\-\_]+.ubuntu.com/ubuntu|panel.ubicast.eu/packaging/apt)/(.*)$ {
+			resolver 127.0.0.1;
+			proxy_pass $1://$2/$3;
+			proxy_cache uc-apt-cache;
+			# do not consider secure urls as new files
+			proxy_cache_key $scheme$proxy_host$uri;
+			# only one request at a time will be allowed to populate a new cache element
+			proxy_cache_lock on;
+			# how long should the data be kept in the cache
+			proxy_cache_valid 200 7d;
+			# instruct browser to cache this
+			expires 7d;
+			# headers
+			proxy_ignore_headers "Cache-Control" "X-Accel-Expires" "Expires";
+			add_header X-Cache $upstream_cache_status;
+		}
 	}
 }