Image digest tag

[jesse-r-s-hines]

Implement remote_tags and implement_digest_tag arguments to k8s_deploy

Description

There are already stubs for an image_digest_tag option, which is documented to tag all pushes with the short digest. Here I implement the option. I've also added a remote_tags option so we can set it to push to latest etc. as well.

Related Issue

Fixes #59

Motivation and Context

Many container registries will garbage collect images pushed without a tag, tagging pushes with a hash is an easy way to avoid that issue.

How Has This Been Tested?

We are currently using this patch in our OpenShift deployment.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.

[michaelschiff]

Hi thanks for the PR! Give us a couple days to take a look and we will get back to you with any questions/concerns or a ✅