Move CI to Boost.CI

[mborland]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.35%. Comparing base (91a4a91) to head (4ab9064).
⚠️ Report is 9 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #104      +/-   ##
===========================================
- Coverage    99.43%   99.35%   -0.08%     
===========================================
  Files          168      168              
  Lines         7556     6833     -723     
===========================================
- Hits          7513     6789     -724     
- Misses          43       44       +1     

see 130 files with indirect coverage changes

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