[WIP] Create and run a GitHub Actions workflow

[Copilot]

• Create welcome-workflow branch
• Create .github/workflows/welcome.yml workflow file with:
  • Workflow name and pull_request event trigger
  • Permission for pull-requests: write
  • Job definition with Ubuntu runner
  • Step to post welcome comment using GitHub CLI
• Create pull request from welcome-workflow to main
• Verify workflow runs successfully
• Merge the pull request

Original prompt

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This section details on the original issue you should resolve

<issue_title>Exercise: Hello GitHub Actions</issue_title>
<issue_description>## Hello GitHub Actions

👋 Hey there @GazdaPLN! Welcome to your Skills exercise!

Create and run a GitHub Actions workflow.

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✨ This is an interactive, hands-on GitHub Skills exercise!

As you complete each step, I’ll leave updates in the comments:

• ✅ Check your work and guide you forward
• 💡 Share helpful tips and resources
• 🚀 Celebrate your progress and completion

Let’s get started - good luck and have fun!

_{— Mona}

_{If you encounter any issues along the way please report them here.}</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Exercise: Hello GitHub Actions #1

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[Copilot]

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