BUG: only remove workspace if not shallow clone

[btkostner]

No description provided.

[codecov-io]

Codecov Report

Merging #200 into master will increase coverage by 0.03%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #200      +/-   ##
==========================================
+ Coverage   81.31%   81.34%   +0.03%     
==========================================
  Files          26       26              
  Lines         562      563       +1     
  Branches      102      106       +4     
==========================================
+ Hits          457      458       +1     
  Misses         79       79              
  Partials       26       26

Impacted Files	Coverage Δ
packages/shipit-deploy/src/tasks/deploy/update.js	100% <100%> (ø)	⬆️
packages/ssh-pool/src/commands/tar.js	65.21% <0%> (ø)	⬆️
packages/ssh-pool/src/commands/util.js	62.5% <0%> (ø)	⬆️
packages/ssh-pool/src/commands/raw.js	68.75% <0%> (ø)	⬆️

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