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Rather than always assuming a missing `WORKDIR` means herokuish, we instead inspect the image to verify that it is. If it is, then and _only_ then do we set WORKDIR. Otherwise, we respect the decision of `docker cp` to execute from within the last known `WORKDIR` context, which is inherited at the image level, not image metadata level. Additionally, speed up `is_image_herokuish_based` by inspecting the environment variables on the image. When there is a "USER=herokuishuser", we can more or less safely assume it is an image that Dokku built, and is therefore a herokuish image. While possible, it would be very strange if a non-herokuish image had this environment variable set, so it is a relatively safe change.