v0.6.4

v0.6.4 - Add label support for ingress VIP

New Features:
- Set both annotation and label vip.capi.gorizond.io/ingress-vip
- Allows using ClusterLabels in Fleet GitRepo for ingress VIP

Changes:
- cluster_reconciler.go: Set label in addition to annotation
- README.md: Add examples for using labels
- cluster_reconciler_test.go: Add test for label setting