Support .tgz extension for the command ADD #68
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Issue details
tgz extension is use to represent a gzip tar file and is correctly extracted by the docker ADD command. It should therefore be part of the list of accepted extension
tgz extension is used in the wild by python for its source tar file https://www.python.org/ftp/python/3.8.3/Python-3.8.3rc1.tgz
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Steps to reproduce/test case
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