What would you like to see here? We should create an image just for this container and push it to gcr.io?

No, just the option to set the image myself, like I can do with the cassandra and sidecar images. And the pull secret would have to be considered, too, just as it also already works for the other two.
Basically, it could look like this in the CassandraDataCenter spec:

apiVersion: cassandraoperator.instaclustr.com/v1alpha1
kind: CassandraDataCenter
metadata:
[...]
datacenter: dc
cluster: mycluster
spec:
nodes: 1
cassandraImage: myCassandraImage
sidecarImage: mySidecarImage
initContainerImage: myInitContainerImage
imagePullSecrets:
- name: myPullSecret
[...]

@jgoeres https://github.com/instaclustr/cassandra-operator/wiki/Migration#v640 its out!

@smiklosovic
Thanks again, works perfectly. 👍
If just every open source project had such committed maintainers as you. :-)

@jgoeres feel free to reach us at Instaclustr, we are always happy to help!