Support Projected Volume mounts in Serverless Functions

[kwiatekus]

Description

As a serverless user, I want to automatically populate a single mounted volume with the keys from multiple secrets, configmaps so that I can synthesize a single directory with various sources of information.
I want to define projected volume mounts feature via Function CR just as it is possible to define those in the other kubernetes workloads.

Reasons

Serverless users often need to build directories that contain multiple types of configuration and secret data.
This will enable serverless users to consume BTP manager provisioned service via dedicated libraries (cloud SDKs promoted via SAP's CAP programming model) natively in serverless functions.

This is a follow up for kyma-project/kyma#14998

Attachments
CAP on kyma sample

projected-volumes

k8s wide motivation

Consuming BTP services bound via secret using cloud SDKs

xsenv usage in k8s

Execution

• API proposal (compare with proposal)

[saphanaacademy]

another use case is when using approuter or hdi-deployer docker images where you need to provide a number configuration files during deployment. currently using config maps but this is neither intuitive or easy for the developer who's used to using a folder of files and for which SAP-provided tooling also uses files. see this hands-on video tutorial series in particular here and here. Thanks.

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