non longer assign superfluous groups video & audio

CHANGELOG.md

@@ -5,6 +5,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+### Fixed
+- no longer assign superfluous groups `video` & `audio`
 
 ## [1.0.0] - 2019-12-22
 ### Added

Dockerfile

@@ -14,12 +14,9 @@ RUN apt-get update && apt-get install --yes --no-install-recommends \
 ARG LAUNCHER_VERSION=1.2.3
 RUN mkdir --parents /toontown-rewritten/launcher \
     && curl -L https://download.toontownrewritten.com/launcher/linux/TTRLinux-v${LAUNCHER_VERSION}.tar.gz \
-        | tar -x -v --strip-components 1 -C /toontown-rewritten/launcher/
-
-RUN useradd player
-RUN usermod --append --groups video,audio player
-
-RUN mkdir /toontown-rewritten/engine \
+        | tar -x -v --strip-components 1 -C /toontown-rewritten/launcher/ \
+    && useradd player \
+    && mkdir /toontown-rewritten/engine \
     && chown player /toontown-rewritten/engine
 USER player
 VOLUME /toontown-rewritten/engine