osbuild2: support setting the default zone in firewall stage

Related to https://github.com/osbuild/osbuild/pull/980

Signed-off-by: Tomas Hozza <thozza@redhat.com>

internal/osbuild2/firewall_stage.go

@@ -4,6 +4,7 @@ type FirewallStageOptions struct {
 	Ports            []string `json:"ports,omitempty"`
 	EnabledServices  []string `json:"enabled_services,omitempty"`
 	DisabledServices []string `json:"disabled_services,omitempty"`
+	DefaultZone      string   `json:"default_zone,omitempty"`
 }
 
 func (FirewallStageOptions) isStageOptions() {}