`./contrib/teamcity/build-configurations.py preview-e.cash`
note the url from the `Preview is available at http://127.0.0.1:41868 for the next 60 minutes.` output
`curl -I http://127.0.0.1:41868` and no headers
Then, build a prod-like docker instance:
```
docker build -t ecash_local .
docker run -it --rm -p 3000:3000 ecash_local
curl -I http://localhost:3000
```
note the expected headers are there