feat: add env vars support in command and script

[eddycharly]

Explanation

Add env vars support in command and script.

Related issue

Fixes #953

[codecov]

Codecov Report

Attention: Patch coverage is 29.41176% with 36 lines in your changes are missing coverage. Please review.

Project coverage is 73.56%. Comparing base (1fd0ae4) to head (6f229d6).

Files	Patch %	Lines
pkg/runner/operations/internal/env.go	0.00%	17 Missing ⚠️
pkg/apis/v1alpha1/binding.go	0.00%	14 Missing ⚠️
pkg/runner/operations/command/operation.go	80.00%	1 Missing and 1 partial ⚠️
pkg/runner/operations/script/operation.go	77.77%	1 Missing and 1 partial ⚠️
pkg/runner/processors/bindings.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #963      +/-   ##
==========================================
- Coverage   74.05%   73.56%   -0.50%     
==========================================
  Files         115      117       +2     
  Lines        3878     3907      +29     
==========================================
+ Hits         2872     2874       +2     
- Misses        809      834      +25     
- Partials      197      199       +2     

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