chore: simplify docker compose file

[lenkan]

• Use --wait option instead of the deps service: https://docs.docker.com/reference/cli/docker/compose/up/
• Use yaml anchors to avoid repetitive healthcheck and environment options.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.59%. Comparing base (2bf0df1) to head (e884a2b).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #293   +/-   ##
=======================================
  Coverage   83.59%   83.59%           
=======================================
  Files          48       48           
  Lines        4225     4225           
  Branches     1029     1055   +26     
=======================================
  Hits         3532     3532           
+ Misses        689      663   -26     
- Partials        4       30   +26     

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