Update Dockerfile

Dockerfile

@@ -26,16 +26,17 @@ COPY --chown=user . $HOME/app
 # Download VOICEVOX Core from latest Release
 RUN curl -sSfL https://github.com/VOICEVOX/voicevox_core/releases/latest/download/download-linux-x64 --output download 
 
-# Give execution permissions
-RUN chmod +x ./download
-
 RUN apt-get update && apt-get install -y jq tree locales
 RUN locale-gen ja_JP.UTF-8
-ENV RUST_BACKTRACE=1
+
+# ここでuserユーザーに切り替え
+RUN useradd -m -u 1000 user
+
 ENV LANG=ja_JP.UTF-8
 ENV LANGUAGE=ja_JP:ja
 ENV LC_ALL=ja_JP.UTF-8
 
+USER user
 
 # Install VOICEVOX Core
 RUN echo y | ./download --output voicevox_core