Create staging environment for win.rustup.rs

The `win.rustup.rs` distribution does not have a staging environment
right now. A new state has been created in Terragrunt to create a new
environment to test the distribution.

terragrunt/accounts/legacy/account.json

@@ -4,6 +4,10 @@
         "regions": [
             {
                 "region": "us-west-1"
+            },
+            {
+                "region": "us-east-1",
+                "alias": "us-east-1"
             }
         ]
     }

terragrunt/accounts/legacy/rustup-dev/win-rustup-rs/terragrunt.hcl

@@ -0,0 +1,13 @@
+terraform {
+  source = "../../../../..//terragrunt/modules/win-rustup-rs"
+}
+
+include {
+  path           = find_in_parent_folders()
+  merge_strategy = "deep"
+}
+
+inputs = {
+  domain_name = "dev-win.rustup.rs"
+  static_bucket = "dev-static-rust-lang-org"
+}