Enable OIDC login

[ThomasBuchinger]

• Vault is now a OIDC provider
• Configure Kubernetes to use Vault for authentication
• Add a CronJob that configures the Host for OIDC authentication
• Increase Terraform interval to 5m
• Save a finished kubecnfig in Vault for easier setup
• Add user public/public to Vault. This user can be used to access non secret data in vault
• Move existing Secrets to the new Secret-Structure
• Reduce TTL on Vaults Kubernetes-Auth to 5m
• Use different SecretEngines for static secrets, generated secrets and non secret data
• Add ClusterSecretStores for the new SecretEngines