Web Summit co-founder Paddy Cosgrave and venture capital veteran Brian Caulfield have taken strategic stakes in Irish restaurant chain Camile Thai.  The move comes as Brody Sweeney’s healthy fast food group teams up with Bobby Healy’s Manna Aero to launch Europe’s first drone delivery service for food. Caulfield, a serial investor and venture partner with Draper Esprit, is taking a 4 per cent stake in the company with Cosgrave taking less than 1 per cent.   “I think Brian and Paddy are both interested in the potential for tech in our business,” said Sweeney, the chief executive and majority shareholder in…