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At present, the diag tool uses its default purge file. However, users may find it beneficial to specify and reuse their own purge file. A new command line option, --purge, has been introduced to allow users to provide their own purge file to diag. When this option is used, the default purge file is ignored. Signed-off-by: Frantisek Hrbata <frantisek.hrbata@espressif.com>