fix(addons): handle empty strings in add-on config forms [R8S-1188] (#3262)

pkg/libhelm/options/install_options.go

@@ -17,6 +17,9 @@ type InstallOptions struct {
 	// Values contains inline Helm values merged with the chart defaults.
 	// If both are provided, entries in Values override those from ValuesFile.
 	Values map[string]any
+	// ResetValues resets to chart defaults before applying Values on upgrade
+	// (Helm's --reset-values), so omitted keys revert rather than persist.
+	ResetValues bool
 	// ValuesFile is a path to a YAML file with Helm values to apply.
 	// File values are applied first; Values take precedence on conflicts.
 	ValuesFile              string

pkg/libhelm/sdk/upgrade.go

@@ -190,6 +190,7 @@ func initUpgradeClient(actionConfig *action.Configuration, upgradeOpts options.I
 	}
 	upgradeClient.TakeOwnership = upgradeOpts.TakeOwnership // Equivalent to --take-ownership flag
 	upgradeClient.MaxHistory = upgradeOpts.MaxHistory
+	upgradeClient.ResetValues = upgradeOpts.ResetValues // Equivalent to --reset-values flag; off unless the caller opts in
 	err := configureChartPathOptions(&upgradeClient.ChartPathOptions, upgradeOpts.Version, upgradeOpts.Repo, upgradeOpts.Registry)
 	if err != nil {
 		return nil, errors.Wrap(err, "failed to configure chart path options for helm release upgrade")