[#831] cmd: fix: --config parameter handling

[yohamta]

Issue: #831

Changes

• Fixed the bug in --config parameter handling
• Added tests for --config parameter

[codecov]

Codecov Report

Attention: Patch coverage is 82.89474% with 26 lines in your changes missing coverage. Please review.

Project coverage is 55.94%. Comparing base (11f4649) to head (c6d06b1).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/config/loader.go	37.50%	8 Missing and 2 partials ⚠️
cmd/config.go	73.91%	4 Missing and 2 partials ⚠️
cmd/restart.go	81.81%	1 Missing and 1 partial ⚠️
cmd/retry.go	86.66%	1 Missing and 1 partial ⚠️
cmd/start.go	83.33%	1 Missing and 1 partial ⚠️
internal/config/config.go	0.00%	2 Missing ⚠️
cmd/dry.go	92.30%	0 Missing and 1 partial ⚠️
cmd/server.go	96.15%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #834      +/-   ##
==========================================
+ Coverage   55.73%   55.94%   +0.20%     
==========================================
  Files          74       75       +1     
  Lines        8108     8096      -12     
==========================================
+ Hits         4519     4529      +10     
+ Misses       3202     3172      -30     
- Partials      387      395       +8     

Files with missing lines	Coverage Δ
cmd/main.go	78.94% <ø> (+2.28%)	⬆️
cmd/scheduler.go	59.37% <100.00%> (-4.73%)	⬇️
cmd/setup.go	76.68% <100.00%> (+1.55%)	⬆️
cmd/startall.go	52.45% <100.00%> (ø)
cmd/status.go	59.45% <100.00%> (+3.57%)	⬆️
cmd/stop.go	59.45% <100.00%> (+3.57%)	⬆️
internal/scheduler/manager.go	68.42% <100.00%> (+0.27%)	⬆️
internal/scheduler/scheduler.go	68.75% <100.00%> (+0.24%)	⬆️
cmd/dry.go	69.23% <92.30%> (+1.23%)	⬆️
cmd/server.go	83.01% <96.15%> (+2.71%)	⬆️
... and 6 more

... and 1 file with indirect coverage changes

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