Use `GE_HOME` to configure root dir for Great Expectations

Edgar R. Mondragónrequested to merge
use-ge-home into 12-add-great-expectations-as-a-test-case 
cd data/
meltano --log-level=debug invoke great_expectations suite list

I get an error about missing configurations (AWS keys, RAW_SCHEMA, etc.) but I think that is independent. I was missing --environment=...

Edited by Edgar R. Mondragón

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