fix(auto-add-contributors): ensure auto-add-contributors doesn't crea…

…te duplicate pull requests (#79)

Related to #75

Update auto-add-contributors action to prevent duplicate pull requests.

* Add a step to check for existing open pull requests with the title
"docs(contributor): contributors readme action update" using the GitHub
CLI command `gh pr list`.
* Output a debug message listing the open pull requests for
troubleshooting purposes.
* Output a warning message using the special warning syntax for GitHub
if an existing open pull request is found.
* Exit the action without creating a new pull request if an existing one
is found.

---

For more details, open the [Copilot Workspace
session](https://copilot-workspace.githubnext.com/DelineaXPM/github-workflows/issues/75?shareId=bb94dd48-6c80-432f-87ec-510292d80091).

.github/workflows/auto-update-contributors.yml

@@ -25,14 +25,20 @@ jobs:
         run: |
           pr_title="docs(contributor): contributors readme action update"
           existing_pr=$(gh pr list --state open --search "$pr_title" --json title --jq '.[].title')
-          if [[ "$existing_pr" == "$pr_title" ]]; then
+          echo "::debug::List of open pull requests: $(gh pr list --state open --json title --jq '.[].title')"
+          if [[ -n "$existing_pr" ]]; then
             echo "Contributors pull request already exists. Exiting."
+            echo "::warning::bypassed per open pull request already exists"
+            echo "OpenContributorRequestAlreadyExists=true" >> $GITHUB_ENV
             exit 0
+          else
+            echo "OpenContributorRequestAlreadyExists=false" >> $GITHUB_ENV
           fi
         env:
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Contribute List
+        if: env.OpenContributorRequestAlreadyExists == 'false'
         uses: akhilmhdh/contributors-readme-action@1ff4c56187458b34cd602aee93e897344ce34bfc # v2.3.10
         with:
           pr_title_on_protected: 'docs(contributor): contributors readme action update'