Fix localDir context for Kaniko on Windows

[cedrickring]

So I'm just extracting the context immediately in the empty dir by passing it as Stdin to the kubectl exec command.

WDYT @priyawadhwa

[codecov-io]

Codecov Report

Merging #1438 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1438   +/-   ##
=======================================
  Coverage   44.53%   44.53%           
=======================================
  Files         112      112           
  Lines        4596     4596           
=======================================
  Hits         2047     2047           
  Misses       2342     2342           
  Partials      207      207

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[priyawadhwa]

Great, thanks for contributing a fix for this! :)