Unmarshal environment in stack

[jLopezbarb]

Signed-off-by: Javier López Barba javier@okteto.com

Fixes #

Proposed changes

• Use Environment unmarshalling in Okteto stack to have same functionality as in Okteto up

[codecov]

Codecov Report

Merging #1478 (4978bd3) into master (270d661) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1478      +/-   ##
==========================================
- Coverage   36.60%   36.59%   -0.02%     
==========================================
  Files          80       80              
  Lines        7614     7600      -14     
==========================================
- Hits         2787     2781       -6     
+ Misses       4471     4464       -7     
+ Partials      356      355       -1     

Impacted Files	Coverage Δ
pkg/model/stack_serializer.go	47.22% <100.00%> (+0.12%)	⬆️

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