terraform: Add testing for terraform in Makefile

terraform/Makefile

@@ -17,6 +17,11 @@ preflight:
 init: ## Initalize terraform
 	terraform init
 
+.PHONY: test
+test:
+	terraform fmt -check -recursive
+	terraform validate
+
 .PHONY: plan
 plan: preflight init ## Run terraform plan (dry-run)
 	terraform plan ${TERRAFORM_PARAMETERS}