Cannot build for `GOARCH=386`

[mamachanko]

What steps did you take:

Build for, say, windows/386:

GOOS=windows GOARCH=386 go build ./...

What happened:

Int overflow. 🤖 💀

# carvel.dev/imgpkg/pkg/imgpkg/registry
pkg/imgpkg/registry/registry.go:202:36: cannot use 9999999999 (untyped int constant) as int value in argument to rand.Intn (overflows)

What did you expect:

It builds w/o problems.

Anything else you would like to add:

imgpkg is not distributed for */386. That's not something we need to change. However, since carvel.dev/imgpkg can be consumed as a library, it should be compatible.

Environment:

• imgpkg version (use imgpkg --version): n/a
• Docker registry used (e.g. Docker HUB): n/a
• OS: windows/386

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