Add packer template for proxy build

Add packer template code to build a proxy node

openstack-proxy/nodeimage.pkr.hcl

@@ -52,7 +52,7 @@ build {
     use_proxy        = false
     user             = var.ssh_username
     groups           = ["proxy"]
-    ansible_env_vars = ["ANSIBLE_HOST_KEY_CHECKING=False", "ANSIBLE_RUN_TAGS=var.ANSIBLE_RUN_TAGS"]
+    ansible_env_vars = ["ANSIBLE_HOST_KEY_CHECKING=False"]
     playbook_file    = "./CRI_XCBC/proxy.yaml"
   }
 }