Add kube version flag (#804)

* add --kube-version flag into template cmd

Signed-off-by: FeLvi-zzz <34182539+FeLvi-zzz@users.noreply.github.com>

* add test

Signed-off-by: FeLvi-zzz <34182539+FeLvi-zzz@users.noreply.github.com>

* modify flag description

Signed-off-by: FeLvi-zzz <34182539+FeLvi-zzz@users.noreply.github.com>

* use switch

Signed-off-by: FeLvi-zzz <34182539+FeLvi-zzz@users.noreply.github.com>

* add comment

Signed-off-by: FeLvi-zzz <34182539+FeLvi-zzz@users.noreply.github.com>

---------

Signed-off-by: FeLvi-zzz <34182539+FeLvi-zzz@users.noreply.github.com>

pkg/app/app.go

@@ -1884,6 +1884,7 @@ func (a *App) template(r *Run, c TemplateConfigProvider) (bool, []error) {
 			SkipCleanup:       c.SkipCleanup(),
 			SkipTests:         c.SkipTests(),
 			PostRenderer:      c.PostRenderer(),
+			KubeVersion:       c.KubeVersion(),
 		}
 		return st.TemplateReleases(helm, c.OutputDir(), c.Values(), args, c.Concurrency(), c.Validate(), opts)
 	})

pkg/app/app_test.go

@@ -2097,6 +2097,7 @@ type configImpl struct {
 	includeNeeds           bool
 	includeTransitiveNeeds bool
 	skipCharts             bool
+	kubeVersion            string
 }
 
 func (c configImpl) Selectors() []string {
@@ -2179,6 +2180,10 @@ func (c configImpl) PostRenderer() string {
 	return ""
 }
 
+func (c configImpl) KubeVersion() string {
+	return c.kubeVersion
+}
+
 type applyConfig struct {
 	args   string
 	values []string
@@ -2213,6 +2218,7 @@ type applyConfig struct {
 	waitForJobs            bool
 	reuseValues            bool
 	postRenderer           string
+	kubeVersion            string
 
 	// template-only options
 	includeCRDs, skipTests       bool
@@ -2361,6 +2367,10 @@ func (a applyConfig) PostRenderer() string {
 	return a.postRenderer
 }
 
+func (a applyConfig) KubeVersion() string {
+	return a.kubeVersion
+}
+
 type depsConfig struct {
 	skipRepos              bool
 	includeTransitiveNeeds bool

pkg/app/config.go

@@ -208,6 +208,7 @@ type TemplateConfigProvider interface {
 	SkipTests() bool
 	OutputDir() string
 	IncludeCRDs() bool
+	KubeVersion() string
 
 	DAGConfig