Add Hello World workflow with ubuntu-latest runner

[Copilot]

Creates a basic workflow demonstrating GitHub Actions with a free hosted runner.

Implementation

• Workflow triggers on push/PR to main, plus manual dispatch
• Single job on ubuntu-latest runner
• Prints "Hello World" via shell command
• Explicit contents: read permission following least-privilege principle

jobs:
  hello-world:
    runs-on: ubuntu-latest
    permissions:
      contents: read

    steps:
      - name: Print Hello World
        run: echo "Hello World"

Original prompt

Create an example Github actions workflow that prints hello world. The workflow shall run on the free github action runner using the standard ubuntu Docker container as workflow job runtime.

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