Add manager label to workers

[omus]

Should assist with manual efforts to terminate all of the workers in a cluster.

[codecov-commenter]

Codecov Report

Merging #38 (264b486) into main (f4788d4) will increase coverage by 0.35%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #38      +/-   ##
==========================================
+ Coverage   51.47%   51.82%   +0.35%     
==========================================
  Files           4        4              
  Lines         136      137       +1     
==========================================
+ Hits           70       71       +1     
  Misses         66       66              

Impacted Files	Coverage Δ
src/pod.jl	97.95% <100.00%> (+0.04%)	⬆️

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