terraform: add vault secret managment to terraform

terraform/vault/main.tf

@@ -0,0 +1,19 @@
+terraform {
+  required_version = ">= 1.0"
+  required_providers {
+    vault = {
+      source  = "hashicorp/vault"
+      version = "~> 4.0"
+    }
+    random = {
+      source  = "hashicorp/random"
+      version = "~> 3.6"
+    }
+  }
+}
+
+provider "vault" {
+  address         = var.vault_address
+  token           = var.vault_token
+  skip_tls_verify = var.vault_skip_tls_verify
+}