add license annotation to package metadata template.

title.

Signed-off-by: Jason Tang <jason@upbound.io>

Author: jastang

package/crossplane.yaml.tmpl

@@ -9,6 +9,7 @@ metadata:
   annotations:
     meta.crossplane.io/maintainer: Upbound <support@upbound.io>
     meta.crossplane.io/source: github.com/crossplane-contrib/provider-upjet-{{ .ProviderName }}
+    meta.crossplane.io/license: Apache-2.0
     meta.crossplane.io/description: |
       Upbound's official Crossplane provider to manage Google Cloud Platform (GCP)
       {{ .Service }} services in Kubernetes.