GHA CI

[cmazakas]

Add GHA CI plus the requisite changes to the code to make it all pass.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (ff33ea5) 81.94% compared to head (b99c50f) 87.98%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #47      +/-   ##
===========================================
+ Coverage    81.94%   87.98%   +6.04%     
===========================================
  Files           76      198     +122     
  Lines         4160    11663    +7503     
===========================================
+ Hits          3409    10262    +6853     
- Misses         751     1401     +650     

Files	Coverage Δ
include/boost/http_proto/buffered_base.hpp	100.00% <ø> (ø)
include/boost/http_proto/detail/type_index.hpp	100.00% <100.00%> (ø)
include/boost/http_proto/impl/context.hpp	85.00% <100.00%> (ø)
include/boost/http_proto/impl/context.ipp	94.11% <ø> (ø)
include/boost/http_proto/impl/fields_base.ipp	93.07% <100.00%> (ø)
include/boost/http_proto/sink.hpp	100.00% <ø> (ø)
include/boost/http_proto/source.hpp	100.00% <ø> (ø)

... and 123 files with indirect coverage changes

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[cppalliance-bot]

GCOVR code coverage report https://47.http-proto.prtest.cppalliance.org/gcovr/index.html
LCOV code coverage report https://47.http-proto.prtest.cppalliance.org/genhtml/index.html
Coverage Diff https://47.http-proto.prtest.cppalliance.org/gcovr/coverage_diff.txt

[cppalliance-bot]

GCOVR code coverage report https://47.http-proto.prtest.cppalliance.org/gcovr/index.html
LCOV code coverage report https://47.http-proto.prtest.cppalliance.org/genhtml/index.html
Coverage Diff https://47.http-proto.prtest.cppalliance.org/gcovr/coverage_diff.txt

[cppalliance-bot]

GCOVR code coverage report https://47.http-proto.prtest.cppalliance.org/gcovr/index.html
LCOV code coverage report https://47.http-proto.prtest.cppalliance.org/genhtml/index.html
Coverage Diff https://47.http-proto.prtest.cppalliance.org/gcovr/coverage_diff.txt