Load admin config for all commands before action

[yottahmd]

This PR is related to #216

[codecov-commenter]

Codecov Report

Merging #244 (9f6e38c) into main (1c9e6e2) will increase coverage by 0.16%.
The diff coverage is 92.94%.

@@            Coverage Diff             @@
##             main     #244      +/-   ##
==========================================
+ Coverage   86.15%   86.31%   +0.16%     
==========================================
  Files          46       46              
  Lines        3286     3282       -4     
==========================================
+ Hits         2831     2833       +2     
+ Misses        326      322       -4     
+ Partials      129      127       -2     

Impacted Files	Coverage Δ
cmd/dagu.go	72.91% <76.92%> (+0.69%)	⬆️
internal/admin/config.go	84.25% <95.65%> (+2.60%)	⬆️
cmd/scheduler.go	100.00% <100.00%> (+9.09%)	⬆️
cmd/server.go	81.25% <100.00%> (+7.33%)	⬆️

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