EmberCLI runtime configuration

We're running an EmberCLI application in our infrastructure, and I'm tasked to make it work better with the rest of our services. One thing that's a bit interesting about EmberCLI is that all it's configuration variables are baked into the build by default. (Specifically in the <meta> tag).

I had trouble finding a way to supply runtime configuration. We have an "API_URL" environment variable that's supplied to all our services so they can find the API. What is the recommended way to supply this url to EmberCLI at run-time, so I can avoid a rebuild and have fully-built docker containers with our frontend application.