src: fix `func.yaml` schema (#805)

Signed-off-by: Zbynek Roubalik <zroubali@redhat.com>

function.go

@@ -20,7 +20,7 @@ type Function struct {
 	// Version at which this function is known to be compatible.
 	// More specifically, it is the highest migration which has been applied.
 	// For details see the .Migrated() and .Migrate() methods.
-	Version string // semver format
+	Version string `yaml:"version"` // semver format
 
 	// Root on disk at which to find/create source and config files.
 	Root string `yaml:"-"`
@@ -40,7 +40,7 @@ type Function struct {
 
 	// Registry at which to store interstitial containers, in the form
 	// [registry]/[user].
-	Registry string
+	Registry string `yaml:"registry"`
 
 	// Optional full OCI image tag in form:
 	//   [registry]/[namespace]/[name]:[tag]
@@ -99,7 +99,7 @@ type Function struct {
 	// Created time is the moment that creation was successfully completed
 	// according to the client which is in charge of what constitutes being
 	// fully "Created" (aka initialized)
-	Created time.Time
+	Created time.Time `yaml:"created"`
 
 	// Invocation defines hints for use when invoking this function.
 	// See Client.Invoke for usage.

schema/func_yaml-schema.json

@@ -20,11 +20,11 @@
 		},
 		"Function": {
 			"required": [
-				"Version",
+				"version",
 				"name",
 				"namespace",
 				"runtime",
-				"Registry",
+				"registry",
 				"image",
 				"imageDigest",
 				"build",
@@ -39,10 +39,10 @@
 				"options",
 				"labels",
 				"healthEndpoints",
-				"Created"
+				"created"
 			],
 			"properties": {
-				"Version": {
+				"version": {
 					"type": "string"
 				},
 				"name": {
@@ -55,7 +55,7 @@
 				"runtime": {
 					"type": "string"
 				},
-				"Registry": {
+				"registry": {
 					"type": "string"
 				},
 				"image": {
@@ -135,7 +135,7 @@
 					"$schema": "http://json-schema.org/draft-04/schema#",
 					"$ref": "#/definitions/HealthEndpoints"
 				},
-				"Created": {
+				"created": {
 					"type": "string",
 					"format": "date-time"
 				},