Support whitespaces around variable names in .env files

[LoicPoullain]

Issue

Resolves #1182.

Solution and steps

• Use str.trim()

Checklist

• Add/update/check docs (code comments and docs/ folder).
• Add/update/check tests.
• Update/check the cli generators.

[codecov-commenter]

Codecov Report

Base: 98.86% // Head: 98.86% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (deca268) compared to base (d3fea57).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##           v3-1-0    #1185   +/-   ##
=======================================
  Coverage   98.86%   98.86%           
=======================================
  Files          96       96           
  Lines        1667     1668    +1     
  Branches      388      388           
=======================================
+ Hits         1648     1649    +1     
  Misses         19       19           

Impacted Files	Coverage Δ
packages/core/src/core/config/env.ts	97.14% <100.00%> (+0.08%)	⬆️

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