feat(libhelm) import libhelm into CE pkg directory [EE-4650] (#8138)

* import libhelm and update some paths

* remove file

* update readme

pkg/libhelm/binary/helm_package.go

@@ -0,0 +1,58 @@
+package binary
+
+import (
+	"bytes"
+	"os/exec"
+	"path"
+	"runtime"
+
+	"github.com/pkg/errors"
+	"github.com/portainer/portainer/pkg/libhelm/options"
+)
+
+// helmBinaryPackageManager is a wrapper for the helm binary which implements HelmPackageManager
+type helmBinaryPackageManager struct {
+	binaryPath string
+}
+
+// NewHelmBinaryPackageManager initializes a new HelmPackageManager service.
+func NewHelmBinaryPackageManager(binaryPath string) *helmBinaryPackageManager {
+	return &helmBinaryPackageManager{binaryPath: binaryPath}
+}
+
+// runWithKubeConfig will execute run against the provided Kubernetes cluster with kubeconfig as cli arguments.
+func (hbpm *helmBinaryPackageManager) runWithKubeConfig(command string, args []string, kca *options.KubernetesClusterAccess) ([]byte, error) {
+	cmdArgs := make([]string, 0)
+	if kca != nil {
+		cmdArgs = append(cmdArgs, "--kube-apiserver", kca.ClusterServerURL)
+		cmdArgs = append(cmdArgs, "--kube-token", kca.AuthToken)
+		cmdArgs = append(cmdArgs, "--kube-ca-file", kca.CertificateAuthorityFile)
+	}
+	cmdArgs = append(cmdArgs, args...)
+	return hbpm.run(command, cmdArgs)
+}
+
+// run will execute helm command against the provided Kubernetes cluster.
+// The endpointId and authToken are dynamic params (based on the user) that allow helm to execute commands
+// in the context of the current user against specified k8s cluster.
+func (hbpm *helmBinaryPackageManager) run(command string, args []string) ([]byte, error) {
+	cmdArgs := make([]string, 0)
+	cmdArgs = append(cmdArgs, command)
+	cmdArgs = append(cmdArgs, args...)
+
+	helmPath := path.Join(hbpm.binaryPath, "helm")
+	if runtime.GOOS == "windows" {
+		helmPath = path.Join(hbpm.binaryPath, "helm.exe")
+	}
+
+	var stderr bytes.Buffer
+	cmd := exec.Command(helmPath, cmdArgs...)
+	cmd.Stderr = &stderr
+
+	output, err := cmd.Output()
+	if err != nil {
+		return nil, errors.Wrap(err, stderr.String())
+	}
+
+	return output, nil
+}