fix: reads db url from config if not in env

[madhavilosetty-intel]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 40.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 68.23%. Comparing base (652f05b) to head (8975f7e).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/app/migrate.go	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #478      +/-   ##
==========================================
- Coverage   68.32%   68.23%   -0.09%     
==========================================
  Files          82       82              
  Lines        9167     9168       +1     
==========================================
- Hits         6263     6256       -7     
- Misses       2578     2587       +9     
+ Partials      326      325       -1     

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