chore(queue): auto scale the task worker

[appleboy]

fix #43

Signed-off-by: Bo-Yi Wu appleboy.tw@gmail.com

[codecov-commenter]

Codecov Report

Merging #44 (d3c2e69) into master (4c2d646) will decrease coverage by 1.84%.
The diff coverage is 76.56%.

@@            Coverage Diff             @@
##           master      #44      +/-   ##
==========================================
- Coverage   86.02%   84.18%   -1.85%     
==========================================
  Files          10       10              
  Lines         365      430      +65     
==========================================
+ Hits          314      362      +48     
- Misses         43       61      +18     
+ Partials        8        7       -1     

Flag	Coverage Δ
go-1.13	?
go-1.14	84.18% <76.56%> (-1.85%)	⬇️
go-1.15	84.18% <76.56%> (-1.85%)	⬇️
go-1.16	84.18% <76.56%> (-1.85%)	⬇️
go-1.17	84.18% <76.56%> (-1.85%)	⬇️
go-1.18	84.18% <76.56%> (-1.85%)	⬇️
ubuntu-latest	84.18% <76.56%> (-1.85%)	⬇️

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Impacted Files	Coverage Δ
worker_empty.go	22.22% <22.22%> (-2.78%)	⬇️
queue.go	82.69% <73.75%> (-6.10%)	⬇️
worker_message.go	88.00% <83.33%> (-2.00%)	⬇️
consumer.go	90.65% <100.00%> (+0.45%)	⬆️
worker_task.go	84.61% <100.00%> (+3.66%)	⬆️
logger.go	76.92% <0.00%> (ø)

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