(Updates with CEO interview)By Rod Nickel and Arunima KumarWINNIPEG, Manitoba, May 25 (Reuters) - U.S. agriculture company Ceres Global Ag Corp said on Tuesday it will build a $350 million canola-crushing facility near the U.S.-Canadian border in Northgate, Saskatchewan, the latest project to capitalize on surging oilseed demand.Canada is the biggest global producer and