[feature] provide an option for the image names that include both image name and digest

[developer-guy]

Is your feature request related to a problem? Please describe.
Not related to a problem, this is a feature request.

Describe the solution you'd like
Once you integrate ko into your release workflow, if you are using the Generic Container builder, you need to provide image and digest information separately as input variables. So, you need to do some bash operations at first to grab the name and digest information as ko outputs the image names including both name and digest information together, I just wanted to ask that is it worth adding a feature to support such cases.

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
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