add-assignee.yml

name: 'Add assignee'
on:
  pull_request:
    types: [opened, ready_for_review]
    branches:
      - 'main'

jobs:
  add-assignee:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout repository
        uses: actions/checkout@v3

      - name: Add Assignee to Pull Request
        uses: actions/github-script@v7
        with:
          github-token: ${{ secrets.GITHUB_TOKEN }}
          script: |
            try {
                const { data: pull } = await github.rest.pulls.get({
                    owner: context.repo.owner,
                    repo: context.repo.repo,
                    pull_number: context.payload.pull_request.number,
                });

                console.log(pull);

                if (!pull.assignees || pull.assignees.length === 0) {
                    await github.rest.issues.addAssignees({
                        owner: context.repo.owner,
                        repo: context.repo.repo,
                        issue_number: context.issue.number,
                        assignees: [context.actor],
                    });
                }

            } catch (error) {
                throw new Error(`Check this error >>> ${error.message}`);
            }