_/.github/workflows/github-os-sample.yml

name: github-os-sample
on:
  workflow_dispatch:
    inputs:
      name:
        description: runs-on
        required: true
        default: ubuntu-latest
jobs:
  main:
    runs-on: ubuntu-latest
    # runs-on: ${{ github.event.inputs.os }}
    steps:
      - run: "echo '${{ github.event.inputs.os }}: hello world!'"