dockerfile: ignore relative source paths for compatibility #1125
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The legacy builder handles relative source paths as they were absolute and so does the copy image. Fileop based implementation took the workdir of source stage into an account. While this behavior can be quite useful it is better to revert to the behavior that is compatible with old builders.
Found when looking at #1123
Signed-off-by: Tonis Tiigi tonistiigi@gmail.com