kctrl package repository release Should Allow Control of Image Tags

[nebhale]

Describe the problem/challenge you have
Currently, there is no way to control the image tags for created and published package repository imgpkg bundles. This prevents the creation of a package repository with a version that includes any build metadata, e.g. 0.0.1+git.c9cc39a

Describe the solution you'd like
The kctrl package repository release command should gain a --tag flag that is the equivalent of the kctrl package release command's --tag flag.

Anything else you would like to add:
Slack

---

Vote on this request

This is an invitation to the community to vote on issues, to help us prioritize our backlog. Use the "smiley face" up to the right of this comment to vote.

👍 "I would like to see this addressed as soon as possible"
👎 "There are other more important things to focus on right now"

We are also happy to receive and review Pull Requests if you want to help working on this issue.