infra: introduce terraform/opentofu for proxmox management

- move ansible project within infra
- introduce terraform/opentofu for proxmox VM management

infra/terraform/README.md

@@ -0,0 +1,25 @@
+# Terraform Configuration
+
+> This project uses OpenTofu instead of Terraform. OpenTofu is a fork of
+> Terraform that is compatible with Terraform configurations and provides
+> similar functionality.
+
+This directory contains Terraform configurations for managing
+infrastructure resources. It includes configurations for Proxmox.
+
+The plan is to eventually migrate all infrastructure management to Terraform,
+including Kubernetes clusters and other resources. Currently, the Proxmox
+configuration is fully managed by Terraform, while Kubernetes resources are
+managed using Helm charts and kubectl commands. Previously, the Proxmox
+configuration was managed using Ansible, but it has been migrated to Terraform
+for better consistency and state management.
+
+The terraform state files are stored in a remote backend, which allows for
+collaboration and state management across different environments. The backend
+configuration is defined in the `backend.tf` file. The backend is set up to use
+minio as the storage backend.
+
+## Proxmox
+
+The Proxmox configuration is located in the `proxmox` directory.
+It uses the Proxmox provider to manage virtual machines and other resources.