iac: add backend infrastructure terraform config

provider.aws.acm.tf

@@ -0,0 +1,13 @@
+resource "aws_acm_certificate" "created" {
+  domain_name               = var.domain_name
+  validation_method         = "DNS"
+  subject_alternative_names = []
+  validation_option {
+    domain_name       = var.domain_name
+    validation_domain = var.domain_name
+  }
+}
+
+resource "aws_acm_certificate_validation" "created" {
+  certificate_arn = aws_acm_certificate.created.arn
+}