feat: force include just-enough-resources-jer for create-arcane-engineering modpack

[nohehf]

When creating a server for create-arcane-engineering modpack I had to force include just-enough-resources-jer.
Here is a PR to add this to the defaults if you wish to, so that it's easier for people that might encounter the same issue :)

[itzg]

Thanks! Extra diffs would be nice to revert, but let me know if that requires too much fighting the IDE/editor.

[itzg]

I just tried out the following and it started up fine. I'll plan on following up to this PR with an exclusion scoped to MC Eternal

services: 
  mc:
    image: itzg/minecraft-server:java8-multiarch
    environment:
      EULA: true
      TYPE: FORGE
      VERSION: "1.12.2"
      CURSEFORGE_FILES: just-enough-resources-jer
      CF_API_KEY: ${CF_API_KEY}
    volumes:
      - mc:/data
      
volumes: 
  mc: {}