go fmt
The new `go fmt` adds `//go:build` lines (https://golang.org/doc/go1.17#tools). Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>
Go build fails on directory with only test files https://github.com/golang/go/issues/8279 Signed-off-by: Maksym Pavlenko <makpav@amazon.com>