COLOMBO, Sri Lanka — Sri Lanka’s foreign minister said on Wednesday that the South Asian island nation had signed an agreement with Chinese state energy giant Sinopec to fast-track a proposed $3.7 billion oil refinery in its southern port city of Hambantota. Sinopec and Sri Lanka will jointly decide the share of refined fuel that will be exported from the facility, Foreign Minister Vijitha Herath told reporters. “This is one of the largest foreign investment projects Sri Lanka has received and we feel it will be important for us,” Herath said. “This refinery has been discussed between the two countries