Deploy release action

Forked/adapted from: rossjwr/pr-preview-action

GitHub Action that deploys releases to GitHub Pages. Works on any repository with a GitHub Pages site.

Features:

• Creates and deploys releases to your GitHub Pages site
• Leaves a comment on the release pull request with a link to the deployment
• Updates the deployment and the comment whenever new commits are pushed to the pull request
• Retains the deployed release when the pull request is closed

URLs look like this: https://[owner].github.io/[repo]/release/[release-dir]/

main URL will still post to: https://[owner].github.io/[repo]