Big Bang package downloads targeting East Australian Azure data centers time out

Summary

we're now seeing similar timeout issues to #1389 (closed) for P1 deployments targeting Azure AKS cluster nodes running within the Australian East data centers:

Failed to pull image "registry1.dso.mil/ironbank/fluxcd/helm-controller:v0.22.2": rpc error: code = Unknown desc = failed to pull and unpack image "registry1.dso.mil/ironbank/fluxcd/helm-controller:v0.22.2": failed to resolve reference "registry1.dso.mil/ironbank/fluxcd/helm-controller:v0.22.2": failed to do request: Head "https://registry1.dso.mil/v2/ironbank/fluxcd/helm-controller/manifests/v0.22.2": dial tcp 15.205.173.153:443: i/o timeout

This issue is preventing Azure customers from deploying Big Bang using the AUS DCs.

initial issue raised with BigBang initiative 1416

Steps to reproduce

Pull any image from ironbank in an AKS resource in any Australian Azure DC

What is the current bug behavior?

timeout

What is the expected correct behavior?

Being able to pull images

Relevant logs and/or screenshots

Possible fixes

Whitelist IPs assigned to Azure Australia regions

Notes

This comes from an initial issue raised with BigBang initiative link

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