Use build.sh for travis build
Use build.sh for travis build

This uses `build.sh` so the GitCommit gets set.

Signed-off-by: John McCabe <a51dda7c7ff50b61eaea0444371f4a6a9301e501@johnmccabe.net>

itscaro/faas-cli,itscaro/faas-cli,itscaro/faas-cli