Add testing for arm64

[neil-hickey]

Describe the problem/challenge you have
Similar to kapp-controller, we should add some kind of testing that verifies the arm64 version of SGC runs properly.

carvel-dev/kapp-controller#736

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[A clear and concise description of what you want to happen. If applicable a visual representation of the UX.]

Anything else you would like to add:
[Additional information that will assist in solving the issue.]

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