try code coverage with grcov
try code coverage with grcov

redtankd/github-test,redtankd/rust-test,redtankd/github-test,redtankd/github-test,redtankd/rust-test,redtankd/rust-test,redtankd/rust-test,redtankd/rust-test,redtankd/github-test,redtankd/rust-test