use in context of location

docker/nginx/conf.d/client.conf

@@ -333,7 +333,8 @@ server {
 		# proxy /skynet/tus requests to siad endpoint with all arguments
 		proxy_pass http://siad;
 
-		# rewrite tus headers to use correct uri
+		# rewrite tus headers to use correct uri from env variable
+		set_by_lua $SKYNET_SERVER_API 'return os.getenv("SKYNET_SERVER_API")';
 		proxy_redirect https://siad $SKYNET_SERVER_API;
 
 		# extract skylink from base64 encoded upload metadata and assign to a proper header