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 Azurecan have consistent titles and sections, it then will be easy for the customer to compare.

[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?