Capture more error info when workers fail to start up

[MichaelHatherly]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 5 lines in your changes missing coverage. Please review.

Project coverage is 29.58%. Comparing base (7fd5636) to head (c4fc30a).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/Malt.jl	33.33%	4 Missing ⚠️
src/server.jl	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #265      +/-   ##
==========================================
- Coverage   29.58%   29.58%   -0.01%     
==========================================
  Files          57       57              
  Lines        2633     2640       +7     
==========================================
+ Hits          779      781       +2     
- Misses       1854     1859       +5     

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