A lightweight Docker image for running Danser (danser-go) on Ubuntu 25.10, complete with FFmpeg, ImageMagick, Node.js, and necessary fonts & libraries.

Used for all the Actions to generate Skins.

Features

Base: Ubuntu 25.10
Danser-go: Automatically downloads the latest Linux build of Wieku/danser-go
FFmpeg: Latest GPL shared build for video processing (Nvidia Support)
ImageMagick: Compiled from source with support for common image formats and fonts
Node.js: Version 20.x and latest npm for any scripting needs
Dependencies: Xvfb, GTK, Ghostscript, Git LFS, font packages, and more
Preloaded Content: Sample beatmap 297969n.osz (Caramel Heaven) and default settings

Directory Structure

/app/danser/
├── songs/           # .osz files (beatmaps) and extracted folders
├── settings/        # Danser configuration JSON files
├── videos/          # Generated videos
├── ffmpeg/          # FFmpeg binaries
└── screenshots/     # Captured screenshots