FEATURE: Decomission hashicorp-vault and create certificates signed by CSM CA and create users in gitea

[Masber]

currently, we store k8s and gitea authentication details in a hashicorp-vault instance which can only be accessed through VPN, this make difficult for manta to be portable.
A solution would be creating an user certificate CSM k8s can accept and create individual users in gitea

[miguelgila]

I think with CSM 1.3+ we can get this working without a lot of work on the mesa/manta side of things::

• TAPMS brings functionality that allows K8s to use OIDC tokens
• The version of Gitea installed can connect to an OIDC provider, we could set it up to use the one within CSM.