Hong Kong is facing about 10 new Covid-19 infections on Monday, a medical source said, a day after officials pledged to test more than 7,000 inmates after two were among Sunday’s 21 new cases.All inmates at the four facilities where the two infected men were being held – Pik Uk Prison in Sai Kung, Lai Chi Kok Reception Centre, Siu Lam Psychiatric Centre and Castle Peak Bay Immigration Centre – would be quarantined on site, or moved to other correctional institutions for isolation.Of Sunday’s…