Additional steps

You have to sync the files in /var/www from an existing repo server. @duane might haev more information on how we pick and choose. The file list is in filelist.{env}.md, but could be outdated.
You may need to run /usr/local/bin/repomirror-cron.sh manually. This script is called by /var/spool/cron/root, so may have run automatically for you, but is required in order to do a succeessful highstate.
Had to run chcon -R -h -t httpd_sys_content_t /var/www/html to fix the context. (Note: This is currently in a PR for the cronjob in #2, so may be implemented automtically by the time you read this.)