Update Dockerfile

Dockerfile

@@ -5,7 +5,7 @@ RUN apt update && \
     apt -y install python3 build-essential chromium libnss3 libfreetype6-dev libharfbuzz-bin libharfbuzz-dev ca-certificates fonts-freefont-otf fonts-freefont-ttf fonts-noto-cjk fonts-noto-cjk-extra && \
     rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* /var/log/*
 RUN useradd -d /app -m -s /bin/bash koishi
-USER /app
+USER koishi
 WORKDIR /app
 COPY --chown=koishi:koishi ./package*.json ./