Set ARM_USE_AZUREAD env var for Terraform init

Added the ARM_USE_AZUREAD environment variable to the Terraform Init step in the vmss-deploy workflow to enable Azure AD authentication.

Author: potatoqualitee

.github/workflows/vmss-deploy.yml

@@ -33,6 +33,8 @@ jobs:
 
       - name: Terraform Init
         working-directory: ./gh-runners
+        env:
+          ARM_USE_AZUREAD: true
         run: terraform init
 
       - name: Terraform Validate