Cron job/script to get deadlines for a particular time period

[sshkhr]

In order to set up some automations (e.g. tweeting about new school additions or a deadline, pre-pouplating posts with important dates) we need a way to periodically scan site/_data/summerschools.yml and perform follow actions. There are many ways to implement this, perhaps a CI bot? Open to discussions from other maintainers/community.