Update Dockerfile

Dockerfile

 FROM registry.gitlab.fachschaften.org/nicolas.lenz/pandoc-plus:latest
 LABEL maintainer="Jonas Zohren"
 
-RUN pacman -Syu && pacman -S --noconfirm community/nodejs community/npm chromium \
+RUN pacman -Syu --noconfirm && pacman -S --noconfirm community/nodejs community/npm chromium \
     && npm install --global mermaid-filter \
-    && useradd --create-home --groups audio,video ciuser \
+RUN useradd --create-home ciuser \
     && echo "{\"args\": [\"--no-sandbox\", \"--disable-setuid-sandbox\"]}" > /home/ciuser/.puppeteer.json
 
 ENV PUPPETEER_SKIP_CHROMIUM_DOWNLOAD=true \