A woman using the bathroom at a Jersey City supermarket told police she caught a worker trying to film her, authorities said. The alleged incident occurred Monday at 99 Ranch Market, an Asian supermarket on Grand Street, Jersey City spokeswoman Kimberly Wallace-Scalcione said. The maintenance worker at the store allegedly used his cell phone to film the 22-year-old woman in one of the stalls. No arrests have been made and the investigation is still active, Wallace-Scalcione said. A manager at 99 Ranch declined to comment. According to an account posted on social media, a janitor informed the w…