Serverless Stack

I have a StaticSite that is a simple HTML page. I’m defining 2 environment variables on my StaticSite and I have `disablePlaceholder: true`  set. What would be the easiest to get those variables replaced on sst start and sst deploy? Isn’t there a native way for SST to replace it. The documentation mentions `{{ MY_VAR }}` but I tried and it doesn’t get replaced.

```    replaceValues: [
      {
        files: "index.html",
        search: "{{ IFRAME_URL }}",
        replace: props.replace.iframe_url,
      },```

```  &lt;body&gt;
    &lt;iframe
      style="width: 100%; height: 100vh"
      class="frame"
      src="{{ IFRAME_URL }}"
      allow="autoplay" /&gt;
  &lt;/body&gt;```