Prepend git tag with v (#465)

Author: ansd

.github/workflows/release.yml

@@ -2,7 +2,7 @@ name: Release
 on:
   push:
     tags:
-    - '*.*.*'
+    - 'v*.*.*'
 
 jobs:
   kubectl_rabbitmq:

hack/rabbitmq.yaml

@@ -5,7 +5,7 @@ metadata:
 spec:
   homepage: https://github.com/rabbitmq/cluster-operator
   shortDescription: Manage RabbitMQ clusters
-  version: v{{ .TagName }}
+  version: {{ .TagName }}
   description: |
     A plugin providing utilities to operate RabbitMQ clusters deployed
     by the RabbitMQ cluster operator.