Support digest image format like repo/image@sha256:xxxx...

[justjake]

Cookbook version

4.9.0

Chef-client version

14.9.13

Platform Details

Ubuntu 18.04

Scenario:

I would like to specify a docker_container resource to an immutable digest in sha256:c6a... format instead of using a mutable docker tag.

Steps to Reproduce:

This docker resource produces the problem:

docker_container 'sad' do
  repo 'hello-world'
  tag 'sha256:0add3ace90ecb4adbf7777e9aacf18357296e799f81cabc9fde470971e499788'
end

Expected Result:

I expect docker to use my digest correctly and download and use the image with that digest from the registry

Actual Result:

Specifying tag 'sha256:....' results in a docker error invalid reference format

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