clearer error message if path for githubrelease archive does not exist

[zoop-btc]

What steps did you take: I tried to unpack a github release with the wrong archive name. Here is a vendir.yaml file to replicate:

apiVersion: vendir.k14s.io/v1alpha1
kind: Config
directories:
- path: vendor
  contents:
  # unpacks archive included in the release
  - path: github.com/cloudfoundry-incubator/eirini-release
    githubRelease:
      slug: cloudfoundry-incubator/eirini-release
      tag: v1.2.0
      checksums:
        eirini-cf.tgz: 819b37126f81ad479acc8dcd7e61e8b0e55153d8fa27aa9a04692c38d0c310fe
        eirini-uaa.tgz: efe8a498c67368fac1c46fa52c484261cbf4e78b3291cff69e660cd863342674
        eirini.tgz: b535d9434300e79d11d42acc417148d09054aa32808dab5f12264d3af59ad548
      unpackArchive:
        path: thisfiledoesnotexist.tgz

What happened: You get the error:

vendir: Error: Syncing directory 'vendor': Syncing directory 'github.com/cloudfoundry-incubator/eirini-release' with github release contents: Expected known archive type (zip, tgz, tar)

What did you expect: An error message which tells me that the specified file does not exist. Can be implemented by a check before trying to unpack it.

Environment:

• vendir version: 0.31.0
• OS: Debian Bookworm

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