Uses go/ssh and pkg/sftp as building blocks and implements the common
sharded.Storage interface, shared between the filesystem and webdav
providers.
A couple of notes:
- The provider assumes the user has a working public/private key
connection to the ssh server.
No other authentication method is supported
- The repository path must exist on the server
- (testing related) The pkg/sftp server doesn't offer a way to set a
server filesystem root, so, during testing, it runs from the local
directory which is repo/blob/sftp. So the tests leave some debris
behind. Additionally, that's the reason why id_rsa and known_hosts
are there at all.
- Encrypted keyfiles are currently not supported (but it could be done)
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