a good start of making the ./_benchmarks benchmarker works autonomous by installing dependencies, running them and finally save them on disk as markdown files

Former-commit-id: 685b296f62c63f98455dce36ce52989be772ba34

_benchmarks/benchmarker/installer_unix.go

@@ -0,0 +1,15 @@
+// +build !windows
+
+package main
+
+import (
+	"os/exec"
+)
+
+func sh(script string, args ...string) error {
+	return (&platform{"bin/sh"}).attach(append([]string{script}, args...)...)
+}
+
+func installDotnet(b bundle) error {
+	return sh("./scripts/dotnet-install.sh", b.parseArguments()...)
+}