feat: Adopt-or-Create

[michaelhtm]

Issue #2406

Description of changes:
Allow users to create the resource if adoption fails due to a
NotFound error. With these changes, we are expecting
users to populate all the necessary fields for creation in the
resource spec, and the status fields in the adoption-fields
annotation

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[ack-prow]

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[gfaraj]

Hi @michaelhtm! Quick question -- will this overwrite the entire Kubernetes manifest if it's able to adopt an existing resource? From the code I'm seeing, it seems like that's the case.

In my case, I would like to avoid that if possible. Overwriting the manifest from the adopted resource means I have to hit "sync" again for my argo app. Really, I just want to upsert my resource to match my ACK spec.

While I think overwriting the whole thing does seem like a valid use case, maybe it's possible to support both cases? Might be looking at a separate adoption policy of "upsert" or something like that?

[michaelhtm]

@gfaraj Hello, The entire manifest would be replaced with the spec defined in AWS if the adoption-policy is adopt. With the current implementation, if it's adopt-or-create, the controller will do an update after the adoption, if not it will create the resource. Maybe we need a better name than adopt-or-create..

[gfaraj]

@michaelhtm oh nice, thanks for confirming that, I may have misread part of the changes. Yeah then this seems more like an "upsert" -- maybe that should be the policy name instead?

[ack-prow]

@michaelhtm: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
verify-attribution	6bb2bdd	link	false	/test verify-attribution
unit-test	6bb2bdd	link	true	/test unit-test
sagemaker-controller-test	6bb2bdd	link	true	/test sagemaker-controller-test

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