Since the theme moved to docsy, this preview build broke. It was a workaround because we didn't have permissions for the main repository. Now that's resolved we should use the CI pipeline set up there.
This is a workaround for sfosc/sfosc #79 to build the preview at a regular interval. https://sfosc.org/preview/
It runs a cronjob to see if the SHA hash of the main repository has changed. https://github.com/sfosc/sfosc
If it has, it will push a new build to https://github.com/sfosc/preview.