doc: Note only path-style URL support for S3

This adds a node to mention that currently only path-style URL's are supported for S3, as per code at:
- aa0faa8c7d/internal/backend/s3/config.go (L42-L45)
- aa0faa8c7d/internal/backend/s3/config.go (L48-L62)
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Wouter van Os 2021-01-23 16:54:08 +01:00 committed by GitHub
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@ -239,6 +239,10 @@ For an S3-compatible server that is not Amazon (like Minio, see below),
or is only available via HTTP, you can specify the URL to the server
like this: ``s3:http://server:port/bucket_name``.
.. note:: Currently, restic only supports defining the `path-style URLs <https://docs.aws.amazon.com/AmazonS3/latest/dev/UsingBucket.html#access-bucket-intro>`__. Virtual-hostedstyle URLs, where the bucket name is in the
hostname itself (like ``bucket_name.s3.us-west-2.amazonaws.com``),
is not supported. It should be written in the path-style URL instead,
for example ``s3.us-west-2.amazonaws.com/bucket_name``.
.. note:: Certain S3-compatible servers do not properly implement the
``ListObjectsV2`` API, most notably Ceph versions before v14.2.5. On these