fixing tasks upload_sitemap

among other things

backend/task/src/utils/upload.rs

@@ -64,7 +64,7 @@ pub async fn upload(
         .key(key)
         .body(content.as_bytes().to_vec().into())
         .acl(aws_sdk_s3::types::ObjectCannedAcl::PublicRead)
-        .content_type("application/rss+xml")
+        .content_type("application/xml")
         .send()
         .await?;