Add --helm-debug Flag to Kustomize for Enhanced Helm Debugging (#5751)

* feat: add helm-debug flag

* revert: go.work.sum

* test: add helm chart args helm-debug test

* test: helm debug flag

* refactor: helm debug output

* style: linting

* revert: go.work.sum

api/internal/builtins/HelmChartInflationGenerator.go

@@ -10,6 +10,7 @@ import (
 	"os/exec"
 	"path/filepath"
 	"regexp"
+	"slices"
 	"strings"
 
 	"sigs.k8s.io/kustomize/api/resmap"
@@ -62,6 +63,9 @@ func (p *HelmChartInflationGeneratorPlugin) Config(
 	if len(h.GeneralConfig().HelmConfig.ApiVersions) != 0 {
 		p.HelmChart.ApiVersions = h.GeneralConfig().HelmConfig.ApiVersions
 	}
+	if h.GeneralConfig().HelmConfig.Debug {
+		p.HelmChart.Debug = h.GeneralConfig().HelmConfig.Debug
+	}
 
 	p.h = h
 	if err = yaml.Unmarshal(config, p); err != nil {
@@ -168,13 +172,17 @@ func (p *HelmChartInflationGeneratorPlugin) runHelmCommand(
 		fmt.Sprintf("HELM_DATA_HOME=%s/.data", p.ConfigHome)}
 	cmd.Env = append(os.Environ(), env...)
 	err := cmd.Run()
+	errorOutput := stderr.String()
+	if slices.Contains(args, "--debug") {
+		errorOutput = " Helm stack trace:\n" + errorOutput + "\nHelm template:\n" + stdout.String() + "\n"
+	}
 	if err != nil {
 		helm := p.h.GeneralConfig().HelmConfig.Command
 		err = errors.WrapPrefixf(
 			fmt.Errorf(
 				"unable to run: '%s %s' with env=%s (is '%s' installed?): %w",
 				helm, strings.Join(args, " "), env, helm, err),
-			stderr.String(),
+			errorOutput,
 		)
 	}
 	return stdout.Bytes(), err