Add Vault installation chart

[pratik705]

Uses kustomize to deploy vault helm chart.

• Prior installation:
  • It requires some storage available in the cluster. As user will install vault prior deploying CEPH, the cluster will not be having any storage configured. Hence, we need to consider local storage from the Kubernetes nodes. We can go with Rancher local path provisioner for the same[1].
  • It expects vault-tls-public Kubernetes secret containing FQDN ssl cert/key. We can encrypt "vault-tls-public" using sealed-secret and push to git to consume it using argocd.

[1]
https://github.com/rancher/local-path-provisioner

[sulochan]

Can we add some documentation for this in /docs please ?
In particular install method should include instruction on how to init vault and handle the unseal keys, the admin token etc.
The overall architecture we are going for here. It would be nice to have a blueprint type doc since this is a big change to how everyone is used to handling secrets/config data and it is important we make our vision clear to users and the logic behind it.

I will sync with you offline to help with the content structrue.

[cloudnull]

closed because this pr isn't able to be merged - #87