chore: with predifiend backend

Author: florianow

modules/sapbtp/subaccounts/buildingblock/provider.tf

@@ -1,3 +1,19 @@
+terraform {
+  backend "azurerm" {
+    resource_group_name  = "buildingblocks-tfstates"
+    storage_account_name = "tfstatesw4l8d"
+    container_name       = "tfstates"
+    key                  = "sapbtp/subaccounts/"
+    use_azuread_auth     = true
+  }
+  required_providers {
+    btp = {
+      source  = "SAP/btp"
+      version = "~> 1.8.0"
+    }
+  }
+}
+
 provider "btp" {
   globalaccount = var.globalaccount
   # using ENV vars in meshStack for username and password