Switch CI configuration to boostorg/boost-ci

[mloskot]

Discuss at boostorg#642

[codecov-commenter]

Codecov Report

Merging #3 (e28d730) into develop (f4c70a8) will increase coverage by 17.29%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##           develop       #3       +/-   ##
============================================
+ Coverage    78.70%   96.00%   +17.29%     
============================================
  Files          117      164       +47     
  Lines         5030     9104     +4074     
============================================
+ Hits          3959     8740     +4781     
+ Misses        1071      364      -707     

Impacted Files	Coverage Δ
include/boost/gil/algorithm.hpp	76.97% <100.00%> (+1.47%)	⬆️
test/core/algorithm/for_each_pixel.cpp	100.00% <100.00%> (ø)
include/boost/gil/pixel_iterator_adaptor.hpp	88.88% <0.00%> (-11.12%)	⬇️
include/boost/gil/histogram.hpp	97.44% <0.00%> (-0.44%)	⬇️
include/boost/gil/extension/numeric/affine.hpp	90.38% <0.00%> (-0.19%)	⬇️
include/boost/gil/pixel.hpp	100.00% <0.00%> (ø)
include/boost/gil/channel.hpp	100.00% <0.00%> (ø)
include/boost/gil/utilities.hpp	100.00% <0.00%> (ø)
include/boost/gil/image_view.hpp	100.00% <0.00%> (ø)
include/boost/gil/packed_pixel.hpp	100.00% <0.00%> (ø)
... and 189 more

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