refact/CI: move build files to ./build

[mmetc]

No description provided.

[github-actions]

@mmetc: There are no area labels on this PR. You can add as many areas as you see fit.

• /area agent
• /area local-api
• /area cscli
• /area appsec
• /area security
• /area configuration

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 60.65%. Comparing base (25726b0) to head (afcf2b3).
⚠️ Report is 286 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3665      +/-   ##
==========================================
- Coverage   60.70%   60.65%   -0.05%     
==========================================
  Files         373      373              
  Lines       41153    41153              
==========================================
- Hits        24981    24961      -20     
- Misses      14120    14136      +16     
- Partials     2052     2056       +4     

Flag	Coverage Δ
bats	44.62% <ø> (-0.07%)	⬇️
unit-linux	34.27% <ø> (-0.01%)	⬇️
unit-windows	24.26% <ø> (ø)

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