Support creating pull requests

cnbcool/create-pr:latest

• push
• branch.create
• branch.delete
• pull_request
• pull_request.target
• pull_request.approved
• pull_request.changes_requested
• pull_request.mergeable
• pull_request.merged
• tag_push
• vscode
• auto_tag
• tag_deploy.*

• target_branch: Target branch, type string, required. The target branch refers to the branch in the current repository.
• head_branch: Source branch, type string, optional. Defaults to current branch name CNB_BRANCH. The source branch refers to the branch in the current repository, or a cross-repository branch when doing cross-repository PR.
• head_repo_slug: Source repository slug, type string, required for cross-repository PR.
• title: PR title, type string, optional.
• body: PR content, type string, optional.
• reviewers: PR reviewers, type string, multiple values separated by ,, optional.
• assinees: PR assignees, type string, multiple values separated by ,, optional.
• labels: PR labels, type string, multiple values separated by ,, optional.

$:
  push:
    - stages:
      - name: Create PR on push event
        image: cnbcool/create-pr:latest
        settings:
          title: "test"
          target_branch: "main"
          reviewers: "xxx"
          assignees: "xxx"

After executing the above code, it will create a PR named test, with the current branch as source, main as target branch, xxx as reviewer, and xxx as assignee.