plantuml/.github/workflows/add-triage-label.yml

# https://docs.github.com/en/actions/managing-issues-and-pull-requests/adding-labels-to-issues

name: Label issues
on:
  issues:
    types:
      - reopened
      - opened
jobs:
  label_issues:
    runs-on: ubuntu-latest
    permissions:
      issues: write
    steps:
      - uses: actions/github-script@v6
        with:
          script: |
            github.rest.issues.addLabels({
              issue_number: context.issue.number,
              owner: context.repo.owner,
              repo: context.repo.repo,
              labels: ["triage"]
            })