Fix missing ultralytics-actions install for issues and discussions

[glenn-jocher]

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[UltralyticsAssistant]

👋 Hello @glenn-jocher, thank you for submitting an ultralytics/actions 🚀 PR! This is an automated response. An Ultralytics engineer will review and assist with your PR soon. In the meantime, please ensure the following checklist is complete to help streamline the review process:

• ✅ Define a Purpose: Clearly explain the purpose of your update in the PR description, linking to any relevant issues to provide context. Make sure your commit messages reflect the changes and follow the project's conventions.
• ✅ Synchronize with Source: Check that your PR is up-to-date with the ultralytics/actions main branch. If there are changes upstream, resolve them by clicking 'Update branch' or by using git pull and git merge main locally.
• ✅ Verify CI Checks: Ensure all Continuous Integration (CI) checks are passing. Address any issues if checks fail to maintain code quality.
• ✅ Update Documentation: If your changes impact the functionality, update the respective documentation to reflect this.
• ✅ Add Tests: If needed, write or modify existing tests to cover your changes. Confirm that these tests pass successfully.
• ✅ Sign the CLA: If this is your first contribution to Ultralytics, ensure you’ve signed our Contributor License Agreement by adding "I have read the CLA Document and I sign the CLA" as a comment under your PR.
• ✅ Minimize Changes: Ensure your changes are concise and essential for your objective. Remember, "It is not daily increase but daily decrease, hack away the unessential." — Bruce Lee

For more detailed guidance, refer to our Contributing Guide. Should you have any questions or need further assistance, feel free to reach out in the comments. Thank you for helping improve Ultralytics! 🎉