fix(aad): provider must be specified. cd fails otherwise

modules/service-principal/provider.tf

@@ -0,0 +1,9 @@
+terraform {
+  required_providers {
+    azuread = {
+      source  = "hashicorp/azuread"
+      version = ">=2.22.0"
+    }
+  }
+  required_version = ">= 0.15"
+}