runtime: Use doas -n in TestSUID on OpenBSD

This prevents a hang at a su password prompt when running this test on
OpenBSD.

Fixes #60690.

Change-Id: I62d27aa63f225f8247c324b87b5e688319061f4f
GitHub-Last-Rev: 217813a
GitHub-Pull-Request: #60742
Reviewed-on: https://go-review.googlesource.com/c/go/+/502575
Run-TryBot: David Chase <[email protected]>
Reviewed-by: Bryan Mills <[email protected]>
TryBot-Result: Gopher Robot <[email protected]>
Reviewed-by: David Chase <[email protected]>

Author: jrick

src/runtime/security_test.go

@@ -27,6 +27,8 @@ func privesc(command string, args ...string) error {
 	var cmd *exec.Cmd
 	if runtime.GOOS == "darwin" {
 		cmd = exec.CommandContext(ctx, "sudo", append([]string{"-n", command}, args...)...)
+	} else if runtime.GOOS == "openbsd" {
+		cmd = exec.CommandContext(ctx, "doas", append([]string{"-n", command}, args...)...)
 	} else {
 		cmd = exec.CommandContext(ctx, "su", highPrivUser, "-c", fmt.Sprintf("%s %s", command, strings.Join(args, " ")))
 	}