Add support for Asset as argument to CopyFile

[rbm-radius]

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Issue details

Currently, CopyFile only takes strings (file system paths) as arguments to describe the local and remote files to be copied. Having support for Asset would allow CopyFile to react to changes to the file as an Asset, and would allow a file upload via CopyFile to work the same way as an upload to S3, which is the same thing conceptually.

Affected area/feature

[kwohlfahrt]

+1, this would be extremely useful (especially if it can handle secrets correctly). There is a PR for this in #25, but it's gone a bit stale.

[Bessonov]

@iwahbe Probably, related to or makes #23 obsolete