I don't like the look of that covid app it's full-on 1984 tracking your every move, and reading the user comments it looks like it doesn't work too well either, and it could seriously mess up your trip. People are complaining that they can't go to work because of errors with the app, and the user support is poor to non-existent leaving them in limbo. It sounds like a nightmare considering the app is required to enter every facility or building (including shops, etc.). The real kicker is if you do get pinged then you have to quarantine.

Disclaimer: I think that's a fair summary, but do your own investigation as I may have got some of the details wrong!