Delivery rework

Clean up destination code and add some functionality

• Split the destinations into separate files
• New DestinationTempFile for writing tempfiles into the destination which eventually get added
• All of the close() methods are now streaming
• Implemented ChecksumDecorator, so we get a SHA1SUMS file
• Implemented FetchFile decorator, so we get a rudimentary fetch-all.sh script
• Configured Docker and delivery for local development to have a separate volume mount for serving files

apps/web/ws-nginx.local.conf

@@ -20,10 +20,10 @@ server {
     }
 
     location ~ ^/dl/(?:(.*))/(?:(.*)) {
-        alias /tmp/workspaces_tmp/$1/$2;
+        alias /var/www/$1/$2;
         autoindex on;
         autoindex_exact_size off;
         autoindex_format html;
         autoindex_localtime on;
     }
-}
\ No newline at end of file
+}