Add arm64 images about heighliner HOT 3 CLOSED

Thanks @DavidNix for finding this and helping me troubleshoot. I found out that the build-linux target we are using for gaia is overwriting the GOARCH to amd64. This is fixed by using the build target instead.

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The dockerfiles have been moved here.
All dockerfiles have been updated to cross compile using the host architecture for the build phase, then package the cross compiled binary into the final image with the target architecture in the last qemu step.

Buildkit integration was added here so that CI and local can build the multi-arch images.

chains.yaml has been modified so that all chains will use a make target or build script that allows for cross-compilation

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@agouin I'm on arm64 (m1 mac).

The gaia container is giving me trouble with musl.

❯ docker run -it ghcr.io/strangelove-ventures/heighliner/gaia:v6.0.4 sh
~ # gaiad
qemu-x86_64: Could not open '/lib/ld-musl-x86_64.so.1': No such file or directory
~ # gaiad -h
qemu-x86_64: Could not open '/lib/ld-musl-x86_64.so.1': No such file or directory
~ #

Apologies if this is a known issue.

The failure also happens in ibctest. My workaround is to use juno and osmosis which do not exhibit this issue.

Also, if this should be a separate GH issue with a bug label, let me know!

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