adding error message

[asteurer]

Closes kairos-io/kairos#2152

[codecov]

Codecov Report

Attention: Patch coverage is 37.50000% with 5 lines in your changes missing coverage. Please review.

Project coverage is 48.09%. Comparing base (71e8e5b) to head (61c2639).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/config/spec.go	37.50%	4 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #626      +/-   ##
==========================================
- Coverage   48.15%   48.09%   -0.07%     
==========================================
  Files          48       48              
  Lines        6153     6161       +8     
==========================================
  Hits         2963     2963              
- Misses       2910     2916       +6     
- Partials      280      282       +2     

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[Itxaka]

thanks @asteurer !