feat: add vault and consul roles for terraform-git

Add K8s auth role, consul secret backend role, consul ACL policy, and
vault policy to allow terraform-git CI to store state in Consul.

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

@@ -0,0 +1,7 @@
+bound_service_account_names:
+  - terraform-git
+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-git.yaml

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

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

@@ -0,0 +1,9 @@
+---
+rules:
+  - path: "consul_root/au/syd1/creds/terraform-git"
+    capabilities:
+      - read
+
+auth:
+  k8s/au/syd1:
+    - woodpecker_terraform_git

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

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