Customers at all of Hong Kong’s 16,000 bars and restaurants will be required to use the government’s coronavirus contact-tracing app from as early as next week, the Post has learned, a move drawing widespread industry support for its potential to help boost business. A government source on Friday revealed the possible start time for mandating the “Leave Home Safe” app at those venues following negotiations between officials and catering groups, which sought an extension of the scheme to bring about lighter [Covid](tag?_=covid) -19 regulation and avoid the verification pitfalls of the existing system. “The catering sector was consulted on Thursday...