cyrusimap.org site builder

This project contains the code and automations used to build the website for Cyrus IMAP. It works like this:

• The cyrus-imapd repo includes the source for this site, and a Makefile (in ./docsrc) that will run Sphinx to build the site's HTML.
• The Cyrus Docker container has all the prerequisites for building the site.
• This repository contains a program, build-cyrus-site, that clones a number of versions of cyrus-imapd, builds their docs, and merges them all into a multi-version setup for the site. It also builds the docs for cyrus-sasl.
• This repository, in its .github/workflows directory, has a workflow that runs the build-cyrus-site program in the cyrus-docker container, then publishes the results to GitHub Pages. It does this every hour, or when this repo changes.

You probably only want to edit this code if you want to change how the Cyrus IMAP site is automatically updated. For the site content itself, look at the Cyrus IMAP or Cyrus SASL repositories, instead.