Add automated docker build

[ghost]

• Automatically build docker images for ydk-gen, ydk-py and ydk-go

[ylil93]

Thanks for this change

[codecov]

Codecov Report

Merging #724 into master will decrease coverage by 2.79%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #724      +/-   ##
==========================================
- Coverage   80.46%   77.67%    -2.8%     
==========================================
  Files         170       68     -102     
  Lines       16268     5661   -10607     
  Branches     1470        0    -1470     
==========================================
- Hits        13090     4397    -8693     
+ Misses       2820     1221    -1599     
+ Partials      358       43     -315

Impacted Files	Coverage Δ
sdk/go/core/ydk/types/types.go	57.14% <0%> (-11.51%)	⬇️
sdk/cpp/core/src/path/repository.cpp	87.3% <0%> (-0.4%)	⬇️
ydkgen/builder/_api_model_builder.py
sdk/python/core/ydk/errors/__init__.py
ydkgen/printer/printer_context.py
ydkgen/printer/python/class_inits_printer.py
ydkgen/printer/python/import_test_printer.py
sdk/python/core/tests/test_sanity_types.py
sdk/python/core/ydk/services/executor_service.py
sdk/python/core/tests/test_sanity_path.py
... and 95 more

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