MetalLB Ironbank Images

Mostly opening this issue for awareness that Ironbank MetalLB images exist now - https://repo1.dso.mil/dsop/opensource/metallb

It would probably be good for Big Bang to adopt these in the dev script and CI deployments. There would be changes required to make this work:

• securitycontext needs to be different to use these images
• auth would need to be provided for registry1 in pipelines/dev script when setting up metallb