crane export creates tar even on failure

[mamachanko]

Describe the bug

A tar file is created even though the image failed to be pulled.

To Reproduce

# fails
crane export does-not-exist x.tar

# succeeds
file x.tar

Expected behavior

When crane export some-image some.tar fails, then it should not create a some.tar.

Additional context

Add any other context about the problem here.

❯ crane version
0.20.3

[mamachanko]

The problem appears to be the lack of clean-up in this failure case

go-containerregistry/cmd/crane/cmd/export.go

Line 75 in c4dd792

return fmt.Errorf("pulling %s: %w", src, err)