IOWA CITY — Last year, Goodwill of the Heartland bet big on itself.Known primarily for its retail stores, the nonprofit organization invested $8 million in transforming the former FS Feeds and Hawkeye Food Service Distribution center in Coralville into a facility designed to package vegetable oil. It was a new venture for Goodwill, which also provides janitorial services and does contract manufacturing in fulfilling its mission to help people overcome barriers to independence.“There are all kinds of uncertainties when you’re doing something new,” said Jessica Schamberger, vice president of operations for Goodwill of the Heartland, noting the $8 million investment.