Implement e2e tests for file signing

[saschagrunert]

We recently added a GitHub action job to e2e test the image signing: https://github.com/kubernetes-sigs/release-sdk/blob/main/test/e2e/sign_test.go

Goal is to do the same for file signatures.

@kubernetes-sigs/release-engineering I think this is a good first issue to get in touch with the code base. Is there anyone who want to work on this?

Part of kubernetes/enhancements#3031

[pradeepnnv]

I would like to try this out.

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/lifecycle stale

[sbdtu5498]

/assign

[ShivangShandilya]

I would like to take a look if no one is currently working on this

[xmudrii]

/remove-lifecycle stale

[xmudrii]

@ShivangShandilya As far as I know, there's no progress on this issue. You can give it a try if you're interested!