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This commit makes skopeo return a different exit code when an input is not found. The use case is `osbuild` which uses skopeo to inspect images and it would be nice to differenciate between an image that is not found and general skopeo errors (or errors like network issues etc). I picked exit code `2` for `not found` because it is also the value of `ENOENT`. Man page and a test are added. Signed-off-by: Michael Vogt <mvogt@redhat.com>