Which cloud service to execute your script?

Question

Computer networks

Task: there is a site of the timetable of the university. It has a text field where the date of the last update of the schedule is written, and you need to monitor the change in this field and notify me about it.
Question: are there any cloud services (preferably free) where I can place my program \ script that will do this? The desktop application option on your PC is not suitable.