ServantDocker doesn't work out of the box

tldr;
1. The Dockerfile needs to inherit from haskell:8.6.3
2. The project name needs to be lowercased in several instances.

Steps to reproduce:

`stack new ServantDockerTest servant-docker`

`sudo docker-compose up`

1. "ERROR: no such image: ServantDockerTest: invalid reference format: repository name must be lowercase"

I go to docker-compose.yml and change line 3, 5, 15: to servantdockertest

```

version: '3'
services:
servantdockertest:
build: .
image: servantdockertest
command: ServantDockerTest
expose:
- "1234"
nginx:
build: ./nginx
image: nginx
ports:
- "8080:80"
depends_on:
- servantdockertest

```

2. The build will fail because of ghc mismatch. To get past this, I update the docker image to haskell:8.6.3 **or** I have to go into the stack.yaml and change the resolver from lts-13.4 to lts-11.8

3. sudo docker-compose up will still fail because the upstream can't be found. Have to edit the nginx.conf file for the upstream app.

`
upstream app {
server servantdockertest:1234;
}
`

`sudo docker-compose build`
`sudo docker-compose up`

And everything works.