Fix a small type in `build_test.go` : createServceAccount 😅 (#508)
Fix a small type in `build_test.go` : createServceAccount 😅 (#508)

Signed-off-by: Vincent Demeester <b98c0fd48a8945096c766de790fe70420dd2f223@redhat.com>
knative/build,knative/build