To automatically upload symbols to unity, we need to define the `USYM_UPLOAD_AUTH_TOKEN` variable. Currently the build container ignores this variable, even if it's defined in the github action.
```
2021-03-26T02:35:35.5938747Z time="2021-03-26T02:35:35Z" level=fatal msg="Please provide an auth token with USYM_UPLOAD_AUTH_TOKEN environment variable"
```