osbuild2: extend chrony stage with leapsectz property

Add support for specifying the `leapsectz` property of
`org.osbuild.chrony` stage. Modify stage tests to test setting of the
value.

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

internal/osbuild2/chrony_stage.go

@@ -9,6 +9,7 @@ import (
 type ChronyStageOptions struct {
 	Timeservers []string             `json:"timeservers,omitempty"`
 	Servers     []ChronyConfigServer `json:"servers,omitempty"`
+	LeapsecTz   *string              `json:"leapsectz,omitempty"`
 }
 
 func (ChronyStageOptions) isStageOptions() {}

internal/osbuild2/stage_test.go

@@ -129,10 +129,11 @@ func TestStage_UnmarshalJSON(t *testing.T) {
 							Hostname: "ntp.example.com",
 						},
 					},
+					LeapsecTz: common.StringToPtr(""),
 				},
 			},
 			args: args{
-				data: []byte(`{"type":"org.osbuild.chrony","options":{"servers":[{"hostname":"127.0.0.1","minpoll":0,"maxpoll":4,"iburst":true,"prefer":false},{"hostname":"ntp.example.com"}]}}`),
+				data: []byte(`{"type":"org.osbuild.chrony","options":{"servers":[{"hostname":"127.0.0.1","minpoll":0,"maxpoll":4,"iburst":true,"prefer":false},{"hostname":"ntp.example.com"}],"leapsectz":""}}`),
 			},
 		},
 		{