Add terraform-ipam CI Vault access

Grant the terraform-ipam Woodpecker pipeline the same Vault footprint as the
other terraform-* runners, plus a KV read for its provider tokens:

- k8s auth role woodpecker_terraform_ipam (SA terraform-ipam / woodpecker ns)
- consul secret backend role + ACL policy writing infra/terraform/ipam/*
- consul creds read policy
- kv read policy for kv/service/terraform/ipam (netbox_token + kea_token)

Claude-Session: https://claude.ai/code/session_01JUoARVdmhxKQHyyyp1pxeT

config/auth_kubernetes_role/k8s/au/syd1/woodpecker_terraform_ipam.yaml

@@ -0,0 +1,7 @@
+bound_service_account_names:
+  - terraform-ipam
+bound_service_account_namespaces:
+  - woodpecker
+token_ttl: 600
+token_max_ttl: 600
+audience: https://kubernetes.default.svc.cluster.local

config/consul_secret_backend_role/consul_root/au/syd1/terraform-ipam.yaml

@@ -0,0 +1,5 @@
+consul_roles:
+  - terraform-ipam
+ttl: 120
+max_ttl: 300
+datacenters: []

policies/consul_root/au/syd1/creds/terraform-ipam.yaml

@@ -0,0 +1,11 @@
+---
+rules:
+  - path: "consul_root/au/syd1/creds/terraform-ipam"
+    capabilities:
+      - read
+
+auth:
+  approle:
+    - terraform_ipam
+  k8s/au/syd1:
+    - woodpecker_terraform_ipam

policies/kv/service/terraform/ipam.yaml

@@ -0,0 +1,13 @@
+# Allow the Terraform IPAM runner to read the NetBox + KeaAPI tokens
+# (netbox_token / kea_token fields) used by the netbox and kea providers.
+---
+rules:
+  - path: "kv/data/service/terraform/ipam"
+    capabilities:
+      - read
+
+auth:
+  approle:
+    - terraform_ipam
+  k8s/au/syd1:
+    - woodpecker_terraform_ipam

resources/secret_backend/consul_root/au/syd1/terraform-ipam.hcl

@@ -0,0 +1,7 @@
+key_prefix "infra/terraform/ipam/" {
+  policy = "write"
+}
+
+session_prefix "" {
+  policy = "write"
+}