blog: add Kubernetes sidecar patterns

[askorupka]

Description

Add blog post about Kubernetes sidecar patterns

[linux-foundation-easycla]

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• ✅ login: askorupka / name: Agata Skorupka (1664812, 33fb66d, d424c76, ed3296f, aa13f8f, a5d95b0, f35601b, 205eb3e, 9339b53, 068e2f8, 3803422, e4c452e, 85bc003, 0c28421)

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[askorupka]

/assign @graz-dev

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[sftim]

I like the intent here. We'll need some mechanical changes, eg marking it as draft, and I've suggested rewordings to align with the CNCF position on some details.

I hope this is OK?

[askorupka]

Thanks @sftim for the feedback, changes implemented.