Remove request to database from init method about airflow-provider-great-expectations

[petedejoy]

@jeffkpayne I don't have any branch in progress- we welcome community PRs if you're interested in getting involved :)

[Milchdealer]

Additionally, please change

credentials_path = connection_json['extra__google_cloud_platform__key_path']

to a .get() call because if you use GKE + workload identities, then the google credentials are baked in via the metadata API. I just have a dummy definition of my default connection with (almost) no values, that during the runtime is replaced by the google.auth.default() call.

[jeffkpayne]

FYI, I'm working on this actively (for work) and will be opening a PR, hopefully some time next week. Just need to get setup locally per the standards of this repo.

[jeffkpayne]

There are also other limitations related to how the data_context attribute is initialized inside __init__(). For instance, the gcp_project parameter can't be templated because it's passed into the DataContextConfig created in __init__(). Moving the data_context initialization logic into execute() would allow the other attributes to be templated, in addition to addressing the primary concerns of this issue.

[jeffkpayne]

@petedejoy Were you planning on opening a PR to address this?