Release mac os constructor for earth-analytics-python environment

[eculler]

@nkorinek

This will be used in github actions to more efficiently test notebooks using the earth-analytics-python environment.

Windows and linux releases could also be added eventually so that users can take advantage of quicker install times, but we'll start with Mac OS.

The constructors will not be tracked because they are too large. A construct.yaml will be added, the .gitignore updated to ignore the constructors, and the README updated.