Decouple "push" and "down" implementations

[pchico83]

Fixes #777

[derek]

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Tip: if you only have one commit so far then run: git commit --amend --signoff and then git push --force.

[codecov]

Codecov Report

Merging #778 into master will decrease coverage by 0.08%.
The diff coverage is 2.5%.

@@            Coverage Diff             @@
##           master     #778      +/-   ##
==========================================
- Coverage   32.44%   32.36%   -0.09%     
==========================================
  Files          63       63              
  Lines        4931     4944      +13     
==========================================
  Hits         1600     1600              
- Misses       3199     3212      +13     
  Partials      132      132

Impacted Files	Coverage Δ
cmd/push.go	0% <0%> (ø)	⬆️
cmd/down.go	0% <0%> (ø)	⬆️
pkg/cmd/down/run.go	0% <0%> (ø)	⬆️
pkg/k8s/deployments/crud.go	10.1% <14.28%> (+0.36%)	⬆️

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[rberrelleza]

why would deployment be nil?

[pchico83]

It is for the case it is created by up or push

[derek]

Thank you for your contribution. I've just checked and your commit doesn't appear to be signed-off. That's something we need before your Pull Request can be merged. Please see our contributing guide.
Tip: if you only have one commit so far then run: git commit --amend --signoff and then git push --force.