At present, the steps are executed unconditionally. With this
modification, we can restrict each step individually to determine if it
should run on a particular system. For instance, we can execute
different commands on different systems. This is achieved by adding a
new key, "system," to the step dictionary, with possible values being
Linux, Windows, and Darwin.
Signed-off-by: Frantisek Hrbata <frantisek.hrbata@espressif.com>
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