Update manager kustomization image (#6)

Before, the image would be named `controller` which is the default name
for operator images. There would be no way to distinguish this image
name from other images with the same default name. This commit changes
it to pull from ghcr.io/osac-project/host-management-openstack instead.

Author: ajamias

config/manager/kustomization.yaml

@@ -1,2 +1,8 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
 resources:
-- manager.yaml
+  - manager.yaml
+images:
+  - name: controller
+    newName: ghcr.io/osac-project/host-management-openstack
+    newTag: latest