fix unit test

[oliveromahony]

Proposed changes

Fix failing unit test by mocking IsContainer properly

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING document
• I have run make install-tools and have attached any dependency changes to this pull request
• If applicable, I have added tests that prove my fix is effective or that my feature works
• If applicable, I have checked that any relevant tests pass after adding my changes
• If applicable, I have updated any relevant documentation (README.md)
• If applicable, I have tested my cross-platform changes on Ubuntu 22, Redhat 8, SUSE 15 and FreeBSD 13

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 92.30769% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 66.21%. Comparing base (808c064) to head (599c253).
Report is 6 commits behind head on main.

Files	Patch %	Lines
src/core/environment.go	92.30%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #607      +/-   ##
==========================================
+ Coverage   66.13%   66.21%   +0.08%     
==========================================
  Files         118      118              
  Lines       13485    13471      -14     
==========================================
+ Hits         8918     8920       +2     
+ Misses       3963     3952      -11     
+ Partials      604      599       -5     

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