Add annotations to revisionTemplate for knative

* Adds metadata to the knative spec in the generation command
* Fixes: #815

Tested by running locally and verifying it matched the request
from @Jeff-Lowrey

faas-cli generate \
  --api=serving.knative.dev/v1alpha1 \
  --annotation sidecar.istio.io/inject=true

This also works when bringing in annotations from the YAML
file.

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>

schema/knative/v1alpha1/serving.go

@@ -20,7 +20,12 @@ type ServingSpecRunLatestConfiguration struct {
 }
 
 type ServingSpecRunLatestConfigurationRevisionTemplate struct {
-	Spec ServingSpecRunLatestConfigurationRevisionTemplateSpec `yaml:"spec"`
+	Metadata schema.Metadata                                       `yaml:"metadata"`
+	Spec     ServingSpecRunLatestConfigurationRevisionTemplateSpec `yaml:"spec"`
+}
+
+type ServingSpecRunLatestConfigurationRevisionTemplateMetadata struct {
+	Annotations map[string]string `yaml:"annotations,omitempty"`
 }
 
 type ServingSpecRunLatestConfigurationRevisionTemplateSpec struct {

schema/metadata.go

@@ -5,6 +5,7 @@ package schema
 
 // Metadata metadata of the object
 type Metadata struct {
-	Name      string `yaml:"name"`
-	Namespace string `yaml:"namespace,omitempty"`
+	Name        string            `yaml:"name,omitempty"`
+	Namespace   string            `yaml:"namespace,omitempty"`
+	Annotations map[string]string `yaml:"annotations,omitempty"`
 }