feat: add unique suffix to S3 bucket names

Introduced a `random_string` resource to generate an 8-character suffix
for S3 bucket names, ensuring uniqueness and avoiding naming conflicts.

Author: Heider Oliveira

infra/main.tf

@@ -1,3 +1,9 @@
 resource "aws_s3_bucket" "bucket" {
-  bucket = var.bucket_name
+  bucket = "${var.bucket_name}-${random_string.bucket_suffix.result}"
+}
+
+resource "random_string" "bucket_suffix" {
+  length  = 8
+  special = false
+  upper   = false
 }