doc: add how-to for Cosign signatures and AKV

[yizha1]

fixes #65
fixes #72

Note: Please merge this PR after v1.2.0 is released

Signed-off-by: Yi Zha yizha1@microsoft.com

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[yizha1]

@FeynmanZhou Please comment how to add this document for version v1.2.0

[FeynmanZhou]

@FeynmanZhou Please comment how to add this document for version v1.2.0

@yizha1
This PR change is in the right location.

We need to create another PR to replicate the docs folder to https://github.com/deislabs/ratify-web/tree/main/versioned_docs and name it version-1.2 as a previous version after all v1.2 related docs are finalized.

[susanshi]

Thanks for authoring this workthrough Yi. We discussed this PR at the PR review meeting today. We suggest moving/merging this PR into https://ratify.dev/docs/quickstarts/ratify-on-azure/ doc. Ideally, we should have a consistent format in Ratify walkthroughs, we are hoping Ratify on AWS vs Ratify on Azure can have consistent titles and sections, it then will be easy for the customer to compare.

[susanshi]

left some comments, thanks!

[yizha1]

@akashsinghal @susanshi Please review this doc again. The cosign parts were merged to Ratify on Azure, resulting this doc a bit longer and needing to consider which is common part for Cosign and Notation.

@FeynmanZhou Would you mind updating the e2e picture to reflect that cosign can also be used?

[susanshi]

thanks for the updates Yi. Left some comments.

[susanshi]

Thanks for the updates Yi! LGTM.

[akashsinghal]

LGTM. Thanks Yi!

[susanshi]

LGTM thanks