add app_roles terraform module for vault and declare erp app

hashicorp-vault/iac/modules/app_policy/main.tf

@@ -27,6 +27,11 @@ data "vault_policy_document" "ops" {
     path = "kvv1/google/credentials"
     capabilities = [ "read" ]
   }
+  # read tofu_module_reader gitea bot user ssh keys
+  rule {
+    path = "kvv1/gitea/tofu_module_reader"
+    capabilities = [ "read" ]
+  }
 
   # edit postgres credentials access permissions
   rule {

hashicorp-vault/iac/modules/app_roles/main.tf

@@ -0,0 +1,38 @@
+data "vault_auth_backend" "kubernetes" {
+  path = "kubernetes"
+}
+
+locals {
+  name = lower(var.name)
+  database = var.database == null ? local.name : var.database
+
+  vault_mount_postgres = { path = "postgres" }
+  vault_mount_kvv2 = { path = "kvv2" }
+}
+
+resource "vault_database_secret_backend_role" "role" {
+  backend             = local.vault_mount_postgres.path
+  name                = "${local.name}"
+  db_name             = "postgres"
+  creation_statements = [
+    "CREATE ROLE \"{{name}}\" WITH LOGIN PASSWORD '{{password}}' VALID UNTIL '{{expiration}}';",
+    "GRANT ${local.name}_role TO \"{{name}}\";",
+  ] 
+  revocation_statements = [
+    "REASSIGN OWNED BY \"{{name}}\" TO ${local.name}_role;",
+    "REVOKE ALL ON DATABASE ${local.database} FROM  \"{{name}}\";", # should we drop the role ?
+  ]
+  renew_statements=[]
+  rollback_statements=[]
+}
+
+resource "vault_kubernetes_auth_backend_role" "role" {
+  backend                          = data.vault_auth_backend.kubernetes.path
+  role_name                        = local.name
+  bound_service_account_names      = [local.name]
+  bound_service_account_namespaces = [local.name]
+  token_ttl                        = 3600
+  token_policies                   = ["default", local.name]
+  audience                         = "vault"
+  alias_name_source                = "serviceaccount_name"
+}

hashicorp-vault/iac/modules/app_roles/outputs.tf

@@ -0,0 +1,16 @@
+output "name" {
+  value = local.name
+}
+output "database" {
+  value = local.database
+}
+output "mount_paths" {
+  value = {
+    k8s = data.vault_auth_backend.kubernetes.path
+    pg = local.vault_mount_postgres.path
+    kvv2 = local.vault_mount_kvv2.path
+  }
+}
+output "kvv2_path_prefix" {
+  value = format("%s/", local.name)
+}

hashicorp-vault/iac/modules/app_roles/providers.tf

@@ -0,0 +1,8 @@
+terraform {
+    required_providers {
+      vault = {
+        source = "vault"
+        version = ">= 4.4.0"
+      }
+    }
+}

hashicorp-vault/iac/modules/app_roles/variables.tf

@@ -0,0 +1,8 @@
+variable "name" {
+  type = string
+}
+variable "database" {
+  type = string
+  nullable = true
+  default = null
+}