Build args environment variables support

[fabriciojs]

Issue	-
:toolbox: Improvement	Yes
:open_book: Documentation	Yes
:warning: Break Change	No

Description

Start parsing env vars and Kool Cloud defined variables on deploy images build args.

Updated docs about it.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 69.96%. Comparing base (9b31f94) to head (3917d20).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #509 +/- ## ======================================= Coverage 69.96% 69.96% ======================================= Files 77 77 Lines 3033 3033 ======================================= Hits 2122 2122 Misses 847 847 Partials 64 64 ```

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