Docker wishlist

[kog]

• Step down from UID 0 in container (GH-27: Docker Wishlist - step down from UID 0 #60)
• Publish ARM64 Docker images (Publish ARM64 Docker image #61)
• Generic documentation
• Swap current CMD to an entrypoint script that attempts to load a SQL import script if found (probably need to install sqlite3 tools in the image too)
• Include info for overriding DB and conf in docs