Add GitHub Actions workflow to auto-label new issues with "needs triage"

[ncarenton]

Context

Issue templates already include the needs triage label in their front matter, but this only covers issues created through the template chooser. Issues created via the API, blank issues, or issues where users manually clear labels bypass the templates and miss the label.

Proposed Solution

Add a GitHub Actions workflow (.github/workflows/auto-label-issues.yml) that triggers on issues: opened and applies the needs triage label to every newly created issue.

Suggested implementation

name: Auto-label new issues
on:
  issues:
    types: [opened]

jobs:
  add-needs-triage:
    runs-on: ubuntu-latest
    permissions:
      issues: write
    steps:
      - uses: actions/github-script@v7
        with:
          script: |
            await github.rest.issues.addLabels({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: context.issue.number,
              labels: ['needs triage']
            });