feat: Add support to pull CA Certs from configMap

[velotioaastha]

Add support to pull the list of CA Certs from configMaps (W&B App)

Create configmap

apiVersion: v1
kind: ConfigMap
metadata:
  name: custom-ca-certs
data:
  ca-cert1.crt: |
    -----BEGIN CERTIFICATE-----
    ...
    -----END CERTIFICATE-----
  ca-cert2.crt: |
    -----BEGIN CERTIFICATE-----
    ...
    -----END CERTIFICATE-----

values.yaml
configMapName: "custom-ca-certs"

[velotioaastha]

support for Parquet to pull ca certs from configmap can be added after this PR gets merged

[flamarion]

@velotioaastha, will the configMap with multiple keys with your proposed configuration become multiple certificate files in the /usr/local/share/ca-certificates/?
I didn't test it, but I wonder if simply mounting it as is will have the effect we expect: multiple cert files.
If this is the expected outcome, could you add a line explaining that CM key MUST be something.CRT?
We expect crt files to be parsed by the update-ca-certificates program used by Ubuntu to add the certs to the system ca store.

[velotioaastha]

Yes, with the configuration proposed earlier, mounting a ConfigMap with multiple keys will indeed result in multiple files within the specified directory (/usr/local/share/ca-certificates/), with each key in the ConfigMap corresponding to a separate file. However, for update-ca-certificates to recognize and add these certificates to the system CA store on Ubuntu, each file name in the directory must end with .crt (as given in the description)

Where do you propose I add this line?

[flamarion]

Thank you for your reply @velotioaastha
It would be great if you could add the guidance right above the configuration Here for example.
This is important to ensure customers create the crt files.

[velotioaastha]

We have closed #254 and added the same changes here to support pull CA Certs from configmap for parquet as well
Please re-review @flamarion @danielpanzella