Yet another script to deploy to gh-pages. Also deploys PRs to subdirectory.

• Validates config
• Detects current remote
• Detects PR environment (in GitHub Actions)
• Builds app
• Clones current gh-pages branch
• Removes all files
• Copies new files to gh-pages
  • Uses pr/number subdirectory for PRs.
• If any changes
  • Commit
  • Push

Requires a .gh-pages containing valid json specifying buildCommand. Other defaults that can be overridden are:

{
	commitMessage: 'Deploy #PR to GitHub Pages.',
	branch: 'gh-pages',
	stagingDirectory: 'gh-pages-staging',
};

#PR will be replaced with "PR #X" if in the PR environment.

Runs git config if both GH_USER_NAME and GH_USER_EMAIL env variables are set.