add prep time for bot.

[ReDBrother]

No description provided.

[codecov-io]

Codecov Report

Merging #915 (8db9a67) into master (d7f0337) will decrease coverage by 0.03%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##           master     #915      +/-   ##
==========================================
- Coverage   76.51%   76.48%   -0.04%     
==========================================
  Files          91       91              
  Lines        1686     1688       +2     
==========================================
+ Hits         1290     1291       +1     
- Misses        396      397       +1     

Impacted Files	Coverage Δ
services/app/lib/codebattle/bot/player_server.ex	64.70% <50.00%> (-0.45%)	⬇️

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