create-new-page.yml

name: Create a new web page 

on:
  # Allows you to run this workflow manually from the Actions tab
  workflow_dispatch:
    inputs:
      branch:
        description: "Name of an existing branch for work on the new page"
        required: true
        type: string
      page:
        description: "Name for the new page (becomes part of the URL; use only letters, digits, dashes)"
        required: true
        type: string

jobs:
  create-new-page:
    runs-on: ubuntu-latest
    permissions:
      contents: write
      id-token: write
    steps:
      - name: Checkout the specified branch 
        uses: actions/checkout@v3
        with:
          ref: ${{ inputs.branch }}

      - name: Create page file from template 
        run: 'sed s/page_URL_goes_here/${{ inputs.page }}/ ./_includes/new-page.md > ./pages/${{ inputs.page }}.md'

      - name: Commit the new page file 
        uses: EndBug/add-and-commit@v9 
        with:
          message: 'Create page ${{ inputs.page }}'

      - name: Write summary
        run: echo "You can now edit your new page on branch \`${{ inputs.branch }}\` at \`pages/${{ inputs.page }}.md\`." >> $GITHUB_STEP_SUMMARY