feat(docker/stacks): add creation and update dates (#4418)

* feat(docker/stacks): add creation and update dates

* feat(docker/stacks): put ownership column as the last column

* feat(docker/stacks): fix the no stacks message

api/http/handler/stacks/stack_update.go

@@ -4,6 +4,7 @@ import (
 	"errors"
 	"net/http"
 	"strconv"
+	"time"
 
 	"github.com/asaskevich/govalidator"
 	httperror "github.com/portainer/libhttp/error"
@@ -123,6 +124,7 @@ func (handler *Handler) updateComposeStack(r *http.Request, stack *portainer.Sta
 	}
 
 	stack.Env = payload.Env
+	stack.UpdateDate = time.Now().Unix()
 
 	stackFolder := strconv.Itoa(int(stack.ID))
 	_, err = handler.FileService.StoreStackFileFromBytes(stackFolder, stack.EntryPoint, []byte(payload.StackFileContent))
@@ -151,6 +153,7 @@ func (handler *Handler) updateSwarmStack(r *http.Request, stack *portainer.Stack
 	}
 
 	stack.Env = payload.Env
+	stack.UpdateDate = time.Now().Unix()
 
 	stackFolder := strconv.Itoa(int(stack.ID))
 	_, err = handler.FileService.StoreStackFileFromBytes(stackFolder, stack.EntryPoint, []byte(payload.StackFileContent))