There are two GitHub Actions. First Deploy to GitHub Pages that package branch hugo and run the deployment (e.g. running GoHugo), essentially rendering the webpage to a static webpage. It will build and publish the static website to master branch on the publishing repo.
The master branch is also what you see on glossary.airbyte.com. So whenever you push changes to the hugo branch, it will automatically be merged and deployed.
The hugo branch is not protected and everyone can add. Maybe will change that later. For now, we want a fast update cycle.