Promotion PR Assignees

[aayushsrivastava]

Checklist

• I've searched the issue queue to verify this is not a duplicate feature request.
• I've pasted the output of kargo version, if applicable.
• I've pasted logs, if applicable.

Kargo v1.1.2

Proposed Feature

I would like to add an Assignee to the PR opened by the git-open-pr step.

Motivation

I would like to use marge-bot for automating the merging of Approved PRs so that a developer doesn't have to manually rebase-wait-merge multiple open PRs.

To integrate this bot into an MR, you need to add the Bot as an assignee to the opened PR.

This would make the workflow easier for microservices where there are a lot of promotions happening to the same stage-specific branch.

Suggested Implementation

The git-open-pr promotion step could have a configuration item called Assignees, which is a list of strings. Each item in the list is added as an Assignee when the PR is opened.