Shanghai has been under strict COVID-19 lockdown since April. HECTOR RETAMAL/AFP via Getty Images. Locked-down factory workers at an Apple supplier in Shanghai have revolted over their captivity. The workers, who bunk in 12-person dormitory rooms, stormed their managers' dorm, regional media reported. The workers have been sealed off from the outside world since Shanghai entered Covid-19 lockdown. For more stories visit www.BusinessInsider.co.za Locked-down factory workers at an Apple supplier in Shanghai stormed a dormitory housing company management in protest against their captivity, regional media reported. Taiwan-based Quanta Computer, which makes MacBooks and other computers at a factory in Shanghai,…