install.sh script should be arm64 aware

[GrahamDumpleton]

Describe the problem/challenge you have

The install.sh script referred to in Carvel web site instructions only installs binaries for AMD64. This means it installs binaries that don't work on ARM64 Linux, and doesn't install native ARM64 binaries on MacOS running Apple silicon.

Describe the solution you'd like

Should detect architecture and install ARM64 binaries when appropriate.

Anything else you would like to add:

This will require that kwt finally be released with ARM64 binary.

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