feat: major restructuring in migration to terragrunt

- migrate from individual terraform files to config-driven terragrunt module structure
- add vault_cluster module with config discovery system
- replace individual .tf files with centralized config.hcl
- restructure auth and secret backends as configurable modules
- move auth roles and secret backends to yaml-based configuration
- convert policies from .hcl to .yaml format, add rules/auth definition
- add pre-commit hooks for yaml formatting and file cleanup
- add terragrunt cache to gitignore
- update makefile with terragrunt commands and format target

config/kubernetes_secret_backend_role/kubernetes/au/syd1/cluster-admin.yaml

@@ -0,0 +1,5 @@
+backend: "kubernetes/au/syd1"
+allowed_kubernetes_namespaces:
+  - "*"
+kubernetes_role_type: "ClusterRole"
+extra_labels: {}

config/kubernetes_secret_backend_role/kubernetes/au/syd1/cluster-operator.yaml

@@ -0,0 +1,5 @@
+backend: "kubernetes/au/syd1"
+allowed_kubernetes_namespaces:
+  - "*"
+kubernetes_role_type: "ClusterRole"
+extra_labels: {}

config/kubernetes_secret_backend_role/kubernetes/au/syd1/cluster-root.yaml

@@ -0,0 +1,5 @@
+backend: "kubernetes/au/syd1"
+allowed_kubernetes_namespaces:
+  - "*"
+kubernetes_role_type: "ClusterRole"
+extra_labels: {}

config/kubernetes_secret_backend_role/kubernetes/au/syd1/media-apps-operator.yaml

@@ -0,0 +1,5 @@
+backend: "kubernetes/au/syd1"
+allowed_kubernetes_namespaces:
+  - "media-apps"
+kubernetes_role_type: "Role"
+extra_labels: {}