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

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 East DC.

CC: @ariel.shnitzer