Add "Decoupled Ingestion System" as pipeline trigger type

[jwodder]

Closes #170.

[yarikoptic]

ping: tests aren't happy.

[jwodder]

@yarikoptic That's because GitHub Actions (et alii) is having issues.

[codecov-commenter]

Codecov Report

Merging #168 (ae0c9e4) into master (47daabc) will increase coverage by 3.33%.
The diff coverage is 33.33%.

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@@            Coverage Diff             @@
##           master     #168      +/-   ##
==========================================
+ Coverage   62.77%   66.11%   +3.33%     
==========================================
  Files          10       10              
  Lines        1260     1263       +3     
  Branches      253      254       +1     
==========================================
+ Hits          791      835      +44     
+ Misses        413      349      -64     
- Partials       56       79      +23     

Impacted Files	Coverage Δ
src/tinuous/circleci.py	70.61% <33.33%> (+17.28%)	⬆️

... and 2 files with indirect coverage changes

[jwodder]

@yarikoptic Tests are happy now.