Support arm64 Architecture

[phenixblue]

What would you like to be added:

We need to have MagTape support deployment to arm64 based cluster environments.

We have multi-arch builds of the magtape-init and magtape container images, but we need supported images for opa and kube-mgmt as well.

Related to open-policy-agent/opa#2233 for arm64 support with OPA.

Why is this needed:

Further deployment flexibility

[phenixblue]

It looks like OPA now builds arm64 binaries and container images as of open-policy-agent/opa#4254