PROTON-2253: Introduce simple github actions CI
PROTON-2253: Introduce simple github actions CI

This is a simple CI job triggered by pushes to master and pull requests against
master it builds and tests on Ubuntu/Windows/macOS. It also produces some output
artifacts which have the install area and the generated python packages.

- Using python 3.6 as this is the version that works on all platforms tested
- Have to fix windows chocolately swig to 4.0.1 as 4.0.2 choco package is broken
- Disable ruby build on macOS due to some version mismatch issue

apache/qpid-proton,ssorj/qpid-proton,astitcher/qpid-proton,astitcher/qpid-proton,gemmellr/qpid-proton,ChugR/qpid-proton,ChugR/qpid-proton,ssorj/qpid-proton,gemmellr/qpid-proton,ssorj/qpid-proton,ssorj/qpid-proton,ChugR/qpid-proton,astitcher/qpid-proton,apache/qpid-proton,gemmellr/qpid-proton,ssorj/qpid-proton,astitcher/qpid-proton,ChugR/qpid-proton,apache/qpid-proton,apache/qpid-proton,astitcher/qpid-proton,gemmellr/qpid-proton,apache/qpid-proton,gemmellr/qpid-proton,ChugR/qpid-proton,astitcher/qpid-proton,ChugR/qpid-proton,apache/qpid-proton,ssorj/qpid-proton,gemmellr/qpid-proton