chore: add support for providing override file name

[shini4i]

Closes #260

[codecov]

Codecov Report

Attention: Patch coverage is 77.77778% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 51.05%. Comparing base (4ae69fa) to head (b471d8a).

Files	Patch %	Lines
pkg/updater/updater.go	55.55%	4 Missing ⚠️
internal/models/argo.go	0.00%	1 Missing ⚠️
internal/models/gitops.go	94.11%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #261      +/-   ##
==========================================
+ Coverage   50.97%   51.05%   +0.08%     
==========================================
  Files          25       25              
  Lines        1642     1657      +15     
==========================================
+ Hits          837      846       +9     
- Misses        732      738       +6     
  Partials       73       73              

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[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud