Investigate using CI to update k8s manifests to latest versions of container images

[Pasarus]

What needs to be done?

This is basically dependabot for k8s, bother Dan Nixon about this as he has it noted down somewhere for a similar tool.

How can it be verified?

Testing - unit, system

Report to: (when finished) *<*user>

Please remember to set relevant repository labels, and a story point estimate. If known set the start & due dates too.