kubernetes_manifest flag to skip validation during plan

[DanielHaba]

Description

The common walkaround for missing CRDs is to use other providers like kubectl_manifest or helm_release. The deferred flag on kubernetes_manifest will be more elegant solution, with the same downsides.

Acceptance tests

• [ ] Have you added an acceptance test for the functionality being added?
• [ ] Have you run the acceptance tests on this branch?

Output from acceptance testing:

$ make testacc TESTARGS='-run=TestAccXXX'

...

Release Note

Release note for CHANGELOG:

...

References

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[alexsomesan]

Hi Daniel,

I hate to be a spoiler here, but this approach is not going to work. The kubernetes_manifest resource doesn't just do validation during the plan, it actually retrieves the schema for the resource from the OpenAPI definition available on the cluster API. Even if you could get away with what this PR proposes, there still is a need for schema information. There is no way to work around that, as Terraform requires a uniform and consistent resource structure throughout the lifecycle of the resource.

Just wanted to let you know that we can't merge this kind of change. I do agree the internals of the kubernetes_manifest should be better documented from a developer POV in order to avoid wasting effort like this.