Move testhelper package to pkg so it can be installed as dependency in secrets injector repo

pkg/testhelper/system/system.go

@@ -0,0 +1,53 @@
+package system
+
+import (
+	"fmt"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strings"
+)
+
+// Run executes the provided command within this context
+func Run(name string, args ...string) (string, error) {
+	cmd := exec.Command(name, args...)
+
+	rootDir, err := GetProjectRoot()
+	if err != nil {
+		return "", err
+	}
+
+	// Command will run from project root
+	cmd.Dir = rootDir
+
+	command := strings.Join(cmd.Args, " ")
+	output, err := cmd.CombinedOutput()
+	if err != nil {
+		return string(output), fmt.Errorf("%s failed with error: (%v) %s", command, err, string(output))
+	}
+
+	return string(output), nil
+}
+
+func GetProjectRoot() (string, error) {
+	dir, err := os.Getwd()
+	if err != nil {
+		return "", err
+	}
+
+	for {
+		// check if go.mod exists in current dir
+		modFile := filepath.Join(dir, "go.mod")
+		if _, err := os.Stat(modFile); err == nil {
+			return dir, nil
+		}
+
+		// move one level up
+		parent := filepath.Dir(dir)
+		if parent == dir {
+			// reached filesystem root
+			return "", fmt.Errorf("project root not found (no go.mod)")
+		}
+		dir = parent
+	}
+}