Support for arm64 copies

[uncledru]

I am attempting to copy an arm64 image from one source to another and get an error:

sending status failed: copy image failed: choosing an image from manifest list docker://xxx.dkr.ecr.us-east-1.amazonaws.com/repo:latest: no image found in image index for architecture amd64, variant "", OS linux

I've attempted to set the GOARCH environment variable but that doesn't seem to help.

Nothing in the copy pkg docs stand out: https://pkg.go.dev/github.com/containers/image/v5/copy

Any suggestions? Do we need to build the customer resource with an arm64 architecture?

Edit:

Seems this is what we need - https://pkg.go.dev/github.com/containers/image/[email protected]/types#SystemContext

We can set this based on the env var set in the lambda GOARCH

https://github.com/cdklabs/cdk-ecr-deployment/blob/main/lambda/main.go#L106

[uncledru]

I see this is open #364

@wchaws is this the right approach? I can open another PR with similar changes if needed