integration: add cluster setup and configuration and a few tests

integration/internal/cluster/cmd_linux.go

@@ -0,0 +1,24 @@
+// +build linux
+
+package cluster
+
+import (
+	"context"
+	"os/exec"
+	"syscall"
+
+	"github.com/onsi/gocleanup"
+)
+
+func commandContext(ctx context.Context, name string, args ...string) *exec.Cmd {
+	cmd := exec.CommandContext(ctx, name, args...)
+	cmd.SysProcAttr = &syscall.SysProcAttr{
+		Pdeathsig: syscall.SIGTERM,
+	}
+	gocleanup.Register(func() {
+		if cmd.Process != nil {
+			_ = cmd.Process.Kill()
+		}
+	})
+	return cmd
+}