fix: Do not use digests for Cilium images (#901)

This would break for air-gapped installations as the repo digest
changes when we build the air-gapped bundle.

Depends on #900.
Depends on #899.

Author: jimmidyson

charts/cluster-api-runtime-extensions-nutanix/addons/cni/cilium/values-template.yaml

@@ -25,3 +25,6 @@ certgen:
     useDigest: false
 socketLB:
   hostNamespaceOnly: true
+envoy:
+  image:
+    useDigest: false