Add the SyncArgs option and --sync-args flag (#1375)

* add the SyncArgs option

Signed-off-by: Tim Ramlot <42113979+inteon@users.noreply.github.com>

* add syncArgs to helmDefaults and update index.md

Signed-off-by: Tim Ramlot <42113979+inteon@users.noreply.github.com>

* add --sync-args flags to helmfile sync

Signed-off-by: Tim Ramlot <42113979+inteon@users.noreply.github.com>

* add tests for appendExtraDiffFlags and appendExtraSyncFlags

Signed-off-by: Tim Ramlot <42113979+inteon@users.noreply.github.com>

---------

Signed-off-by: Tim Ramlot <42113979+inteon@users.noreply.github.com>

pkg/config/apply.go

@@ -64,6 +64,8 @@ type ApplyOptions struct {
 	Cascade string
 	// SuppressOutputLineRegex is a list of regexes to suppress output lines
 	SuppressOutputLineRegex []string
+	// SyncArgs is the list of arguments to pass to helm upgrade.
+	SyncArgs string
 }
 
 // NewApply creates a new Apply
@@ -240,3 +242,8 @@ func (a *ApplyImpl) Cascade() string {
 func (a *ApplyImpl) SuppressOutputLineRegex() []string {
 	return a.ApplyOptions.SuppressOutputLineRegex
 }
+
+// SyncArgs returns the SyncArgs.
+func (a *ApplyImpl) SyncArgs() string {
+	return a.ApplyOptions.SyncArgs
+}

pkg/config/sync.go

@@ -32,6 +32,8 @@ type SyncOptions struct {
 	PostRendererArgs []string
 	// Cascade '--cascade' to helmv3 delete, available values: background, foreground, or orphan, default: background
 	Cascade string
+	// SyncArgs is the list of arguments to pass to the helm upgrade command.
+	SyncArgs string
 }
 
 // NewSyncOptions creates a new Apply
@@ -132,3 +134,8 @@ func (t *SyncImpl) PostRendererArgs() []string {
 func (t *SyncImpl) Cascade() string {
 	return t.SyncOptions.Cascade
 }
+
+// SyncArgs returns the sync args
+func (t *SyncImpl) SyncArgs() string {
+	return t.SyncOptions.SyncArgs
+}