Reuse issue with lychee GitHub Action

The default workflow in the lychee-action repository creates a new issue for each run of the link checker.

As an alternative, this workflow demonstrates how to reuse an existing issue instead. It uses the last-issue-action to find the last issue with the label link-checker and then uses the create-issue-from-file action to update the issue with the results of the lychee link checker.

- name: Find Link Checker Issue
  uses: micalevisk/last-issue-action@v2
  with:
    state: open
    labels: |
      link-checker
- name: Update Issue
  uses: peter-evans/create-issue-from-file@v5
  with:
    title: Broken links detected in docs 🔗
    # Update an existing issue if one was found (issue-number),
    # otherwise an empty value creates a new issue:
    issue-number: "${{ steps.link-checker-issue.outputs.issue_number }}"
    content-filepath: ./lychee/out.md
    token: ${{secrets.GITHUB_TOKEN}}
    labels: |
      link-checker