Fix invalid crd output from helm show crds

[MrMarkW]

Updated CRD generation in Makefile to append --- to crd files.

Issue

Description

Checklist

• Added tests that cover your change (if possible)
• Added/modified documentation as required (such as the README.md, or the docs directory)
• Manually tested
• Made sure the title of the PR is a good description that can go into the release notes

BONUS POINTS checklist: complete for good vibes and maybe prizes?! 🤯

• Backfilled missing tests for code in same general area 🎉
• Refactored something and made the world a better place 🌟

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: MrMarkW
Once this PR has been reviewed and has the lgtm label, please assign oliviassss for approval. For more information see the Code Review Process.

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[linux-foundation-easycla]

• ❌ - login: @MrMarkW / name: Mark Whelan . The commit (024749a) is not authorized under a signed CLA. Please click here to be authorized. For further assistance with EasyCLA, please submit a support request ticket.

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @MrMarkW. Thanks for your PR.

I'm waiting for a github.com member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[k8s-triage-robot]

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/lifecycle stale