Fix some Codacy warnings

pkg/api/check/check.go

@@ -16,10 +16,12 @@ type Handler struct {
 	Client container.Client
 }
 
+// CheckRequest defines the type for the request data of the Check endpoint
 type CheckRequest struct {
 	ContainerId string
 }
 
+// CheckResponse defines the type for the response data of the Check endpoint
 type CheckResponse struct {
 	ContainerId       string
 	HasUpdate         bool

pkg/api/list/list.go

@@ -17,6 +17,7 @@ type Handler struct {
 	Client container.Client
 }
 
+// ContainerListEntry defines the type of each container in the response
 type ContainerListEntry struct {
 	ContainerId      string
 	ContainerName    string
@@ -25,6 +26,8 @@ type ContainerListEntry struct {
 	ImageVersion     string
 	ImageCreatedDate string
 }
+
+// ListResponse defines the return type of the List endpoint
 type ListResponse struct {
 	Containers []ContainerListEntry
 }