adding init

[robinmordasiewicz]

Adds the necessary configurations for integrating Flannel into the project infrastructure. The following changes have been made across various files:

1. Added HelmRelease and HelmRepository configurations for Flannel deployment in the manifests/infrastructure/flannel directory.
2. Included a Kustomization file to manage resources related to Flannel deployment.
3. Added a Namespace configuration for kube-flannel with specific labels in the manifests/infrastructure/flannel/namespace.yaml file.
4. Updated the manifests/infrastructure/kustomization.yaml file to include the Flannel directory.
5. Adjusted configurations in the terraform/spoke-k8s_cluster.tf file to include user-assigned identity and role assignments for network permissions.
6. Modified network profile settings, identity type, and added a new max_pods attribute in the azurerm_kubernetes_cluster resource block.
7. Updated the subnet configurations in the terraform/spoke-network.tf file, including subnet prefixes and route table settings.
8. Adjusted variables for subnet names, prefixes, and additional AKS subnet configurations in the terraform/terraform.auto.tfvars and terraform/variables.tf files.

These changes enable the initialization and deployment of Flannel within the project's Kubernetes infrastructure, enhancing network connectivity and resource management.