GitHub Actions provide CI/CD support, which might interest many GitHub users. I've applied for this feature a week ago. Luckily, my application for the trial was approved by GitHub. Tonight, I've found the motivation for making my first step in my forked repo VincentTam/beautiful-jekyll.
Clicked on the “Action” tab of the repo. Chose the workflow file template for Jekyll. Added a slash / in front of srv in chmod 777 srv/jekyll, so as to fix the “no such file or directory” error.