Support push_targets in container_bundle

[codersasha]

PR Checklist

Please check if your PR fulfills the following requirements:

• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• Other... Please describe:

What is the current behavior?

container_bundle only supports a strange dictionary format for images.

What is the new behavior?

container_bundle can take a push_targets parameter, and the info for the image (repository, tag, etc) is taken from existing push rules. This also means contains_bundle supports using tag_files, and the subsequent push-all rule can push using these tag files as well.

Does this PR introduce a breaking change?

• Yes
• No

Other information