fix: the same-storage check in the new pre-sign feature

[ertuil]

I tried the recent pre-sign feature in #2855 , but it does not work for my Aliyun OSS. In particular, I tried this feature with the latest test docker image with Aliyun OSS. I set presign to true and restarted the container several times. However, it seems that it doesn't work out, as the ExternalUrls are not changed after I saw a 'links pre-signed' message in my log.

After an examination, I find the debug. In the original code, it checks if the endpoint matches the ExternalLinks's hostname. However, it does not work out in my Aliyun OSS cases, and I return the pre-sign link 'As-Is' to the original one.

My endpoint is https://oss-cn-shanghai.aliyuncs.com, while my ExternalLinks's hostname is <bucket-name>.oss-cn-shanghai.aliyuncs.com. Therefore, they can not match with a simple strings.Contain().

What I did:

• add additional codes to match the endpoint and the resource's ExternalLinks's hostname.
• disable set the new resource's ACL to 'public_read' if presign (feat: pre-signed URL for S3 storage #2855 ) feature is enabled.

[boojack]

LGTM