docker-neo4j: Can't override heap configuration

I have tried everything at this point:

• -v /docker-store/neo4j/conf:/conf
• -v /docker-store/neo4j/conf:/var/lib/neo4j/conf
• -v /docker-store/neo4j/conf/neo4j.conf:/conf/neo4j.conf
• -v /docker-store/neo4j/conf/neo4j.conf:/var/lib/neo4j/conf/neo4j.conf
• Edit /conf/neo4j.conf in vi, commit container and launch the new container

Nothing seems to stick, and this works for pretty much every other docker image I have ever used.

I saw another person had the issue, but was not able to successfully use their solution: https://github.com/neo4j/docker-neo4j/issues/95

• System: Ubuntu 18.04 x86_64
• Docker Version:

ii  docker-ce                                  5:18.09.0~3-0~ubuntu-bionic                 amd64        Docker: the open-source application container engine
ii  docker-ce-cli                              5:18.09.0~3-0~ubuntu-bionic                 amd64        Docker CLI: the open-source application container engine

• Docker Launch Script:

#!/bin/bash
docker run --name neo4j --restart=unless-stopped -p 7474:7474 -p 7687:7687 \
        -v /docker-store/neo4j/conf:/conf \
        -v /docker-store/neo4j/data:/data \
        --user 1000 -d neo4j