dns: use linode object storage for tfstate

dns/main.tf

@@ -5,6 +5,15 @@ terraform {
 			version = "1.26.0"
 		}
 	}
+
+	backend "s3" {
+		bucket = "treehouse-state"
+		key = "tfstate"
+		region = "us-southeast-1"
+		endpoint = "us-southeast-1.linodeobjects.com"
+		skip_credentials_validation = true
+		skip_region_validation = true
+	}
 }
 
 provider "linode" {