Support s3:// protocol

[seanorama]

Describe the problem/challenge you have

Need to fetch artifacts from AWS S3 buckets.

We, and our vendors, distribute artifacts with S3. Some buckets are secured so can't be accessed anonymously via the https:// path.

Describe the solution you'd like

Support s3:// like this:

apiVersion: vendir.k14s.io/v1alpha1
kind: Config
directories:
- path: vendor
  contents:
  - path: my-package
    s3:
      url: s3://bucket-name/packages/my-package.tgz

It should use the AWS SDK, such that it automatically uses the authentication from the environment (variables, credential file, credential process, instance metadata, ...).

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[cppforlife]

@seanorama that sounds like a good feature. any interest in giving it a shot?

[voor]

This came up today in conversation, it was more of a "oh, I guess it doesn't support this" rather than "it needs to support this" -- just wanted to capture the metric.

[seanorama]

@seanorama that sounds like a good feature. any interest in giving it a shot?

That's outside my skillset, sorry.