sanity-preview-branch.yml

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# This Workflow is used to mirror the main branch to a preview branch.
# Each time the main branch is updated, the preview branch will be updated.
# Useful for having a fixed preview URL that can be used by Sanity Studio.
# The SANITY_STUDIO_USE_STEGA environment variable should be set to true for the preview branch.
# Github Worflow permissions should be set to Read and write => https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/enabling-features-for-your-repository/managing-github-actions-settings-for-a-repository#configuring-the-default-github_token-permissions
# If using Vercel, the Vercel Authentication setting should be disabled => https://vercel.com/docs/security/deployment-protection/methods-to-protect-deployments/vercel-authentication#managing-vercel-authentication
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name: Sanity Preview Branch

on:
  push:
    branches:
      - main

jobs:
  mirror:
    runs-on: ubuntu-latest

    steps:
      - name: Checkout code
        uses: actions/checkout@v2

      - name: Fetch latest changes
        run: git fetch origin main

      - name: Push to Mirror Branch
        run: |
          git checkout -b preview
          git push --force origin preview
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}