Add support for --validate on chartify (#1960)

Apparently we needed to pass `--validate` on helm-template run by chartify when the targeted chart contains Capabilities.APIVersions in a chart template. Otherwise, you can never make such chart work with chartify, as at apply time helm template expressions that involved Capabilities.APIVersions are already nowhere.

pkg/app/app.go

@@ -172,6 +172,7 @@ func (a *App) Diff(c DiffConfigProvider) error {
 			SkipRepos:   c.SkipDeps(),
 			SkipDeps:    c.SkipDeps(),
 			IncludeCRDs: &includeCRDs,
+			Validate:    c.Validate(),
 		}, func() {
 			msg, matched, affected, errs = a.diff(run, c)
 		})
@@ -238,6 +239,7 @@ func (a *App) Template(c TemplateConfigProvider) error {
 			SkipDeps:      c.SkipDeps(),
 			IncludeCRDs:   &includeCRDs,
 			SkipCleanup:   c.SkipCleanup(),
+			Validate:      c.Validate(),
 		}, func() {
 			ok, errs = a.template(run, c)
 		})
@@ -392,6 +394,7 @@ func (a *App) Apply(c ApplyConfigProvider) error {
 			WaitForJobs: c.WaitForJobs(),
 			IncludeCRDs: &includeCRDs,
 			SkipCleanup: c.RetainValuesFiles() || c.SkipCleanup(),
+			Validate:    c.Validate(),
 		}, func() {
 			matched, updated, es := a.apply(run, c)
 

pkg/app/config.go

@@ -57,6 +57,7 @@ type ApplyConfigProvider interface {
 	DiffOutput() string
 
 	RetainValuesFiles() bool
+	Validate() bool
 	SkipCleanup() bool
 	SkipDiffOnInstall() bool
 
@@ -90,6 +91,7 @@ type DiffConfigProvider interface {
 
 	Values() []string
 	Set() []string
+	Validate() bool
 	SkipCRDs() bool
 	SkipDeps() bool