Added a learning-loop image build/push (#60) #46

Job	Run time
build (ubuntu1804-build, vowpal_wabbit/ubuntu1804-build.Dockerfile, ./)	33s
build (ubuntu2004-build, vowpal_wabbit/ubuntu2004-build.Dockerfile, ./)	42s
build (centos7_6_1810-build, vowpal_wabbit/centos7_6_1810-build.Dockerfile, ./)	42s
build (manylinux2010-build, manylinux2010-build.Dockerfile, ./vowpal_wabbit/manylinux/)	3m 40s
build (manylinux2014_aarch64-build, manylinux2014_aarch64-build.Dockerfile, ./vowpal_wabbit/manyl...	3m 44s
build (manylinux2014_x86_64-build, manylinux2014_x86_64-build.Dockerfile, ./vowpal_wabbit/manylin...	3m 42s
build (rl-manylinux2010-build, rl-manylinux2010-build.Dockerfile, ./reinforcement_learning/manyli...	35s
build (rl-manylinux-2_28-build, rl-manylinux-2_28-build.Dockerfile, ./reinforcement_learning/many...	3m 24s
build (rl-ubuntu-1804, reinforcement_learning/ubuntu1804-build.Dockerfile, ./)	3m 39s
	20m 41s

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