Johnny Ronan, one of Ireland’s most successful property developers, has apologised after a video went viral in recent days showing him joking with friends three months ago about Covid-19.  The video spread unexpectedly on Whatsapp this week before leaking onto other social media. At the time it was made by double Olympic cyclist Philip Cassidy on February 29, it had been shared only to a small group of friends before somehow it spread more widely.   Cassidy is a friend of Ronan, who is also a keen cyclist, and they were on a cycling trip together in February in Cape…