chore(infra): refactor

[sinanmohd]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @sinanmohd, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request refactors the infrastructure configuration, primarily moving NixOS configurations into a new infra/nixos directory structure to support multi-node Kubernetes deployments. It updates SOPS encryption rules for better key management and refines Terraform configurations for Azure, including setting up distinct primary and ingress nodes with specific network and storage configurations.

Highlights

• Directory Restructuring: Reorganized NixOS configurations from nix/nixos to infra/nixos for improved modularity and clarity.
• SOPS Key Management Enhancement: Updated .sops.yaml to use more descriptive key aliases and key_groups for precise access control, particularly for new primary and ingress Kubernetes nodes.
• NixOS Node Specialization: Replaced a single "master" NixOS configuration with distinct primary and ingress node configurations, enabling tailored setups for different Kubernetes roles.
• K3s Setup Refinement: Modified the K3s module to externalize the server token into a dedicated secrets file and moved clusterInit to the primary node's specific configuration.
• Azure Infrastructure Provisioning: Introduced new Terraform configurations for an Azure ingress subnet and network security group, and added a dedicated NFS disk for the primary Kubernetes node.

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[gemini-code-assist]

Code Review

This pull request refactors the infrastructure configuration, moving from a single 'master' node setup to a more modular 'primary' and 'ingress' node structure. The changes improve the organization of NixOS and Terraform code. However, I've found several critical issues that will prevent the infrastructure from deploying correctly. These include placeholder values, incorrect firewall rules in Terraform, and dangling references to deleted resources in the Terraform configuration for the primary node. Please address these issues to ensure a successful deployment.