chore: better JSON Schema (#1968)

Signed-off-by: Matej Vasek <mvasek@redhat.com>

pkg/functions/function.go

@@ -77,7 +77,7 @@ type Function struct {
 
 	// Invoke defines hints for use when invoking this function.
 	// See Client.Invoke for usage.
-	Invoke string `yaml:"invoke,omitempty"`
+	Invoke string `yaml:"invoke,omitempty" jsonschema:"enum=http,enum=cloudevent"`
 
 	// Build defines the build properties for a function
 	Build BuildSpec `yaml:"build,omitempty"`

schema/func_yaml-schema.json

@@ -164,6 +164,10 @@
 					"format": "date-time"
 				},
 				"invoke": {
+					"enum": [
+						"http",
+						"cloudevent"
+					],
 					"type": "string",
 					"description": "Invoke defines hints for use when invoking this function.\nSee Client.Invoke for usage."
 				},