Configure artifacts using URIs, e.g `s3://my-bucket/my-key`

# Summary

It might be convenient and more compact to represent artifacts by URIs. A bit like [go getter](https://github.com/hashicorp/go-getter), but with the option to put as well as get.

# Use Cases

Add more repositories.

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**Message from the maintainers**:

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The issue names no source files, tests, or entry points; start by locating the artifact configuration and repository-handling code, then compare the proposed URI approach with the linked go-getter project. Done would require a decided design that supports adding repositories and getting and putting artifacts through URIs such as s3://my-bucket/my-key.

Written by the indexing model from the issue text.