fix: clone if dir does not exist

[alexander-fenster]

Because of this bug, it will try running commands from the non-existent directory, which will fail with ENOENT. I straced the process to understand what's going wrong :)

84007 chdir("/usr/local/google/home/fenster/.repo/gcp-metadata") = -1 ENOENT (No such file or directory)

[codecov-io]

Codecov Report

Merging #128 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #128   +/-   ##
=======================================
  Coverage   94.07%   94.07%           
=======================================
  Files          12       12           
  Lines         995      995           
  Branches       60       60           
=======================================
  Hits          936      936           
  Misses         40       40           
  Partials       19       19

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