Return error if the config file is invalid.

[kislaykishore]

• Return error if config file is invalid
• Refactor the root command to make it testable.

Description

Link to the issue in case of a bug fix.

NA

Testing details

1. Manual - NA
2. Unit tests - NA
3. Integration tests - NA

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 7 lines in your changes missing coverage. Please review.

Project coverage is 71.98%. Comparing base (b27d3fd) to head (245171f).
Report is 1 commits behind head on master.

Files	Patch %	Lines
main.go	0.00%	6 Missing ⚠️
cmd/root.go	93.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2048      +/-   ##
==========================================
+ Coverage   71.79%   71.98%   +0.19%     
==========================================
  Files          99       99              
  Lines       10862    10871       +9     
==========================================
+ Hits         7798     7826      +28     
+ Misses       2731     2712      -19     
  Partials      333      333              

Flag	Coverage Δ
unittests	71.98% <66.66%> (+0.19%)	⬆️

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