works

Dockerfile

@@ -4,9 +4,17 @@ ENV DEBIAN_FRONTEND noninteractive
 ENV HOME /root
 
 RUN apt update && apt -y upgrade
+RUN apt install -y python3-pip ffmpeg locales
+RUN echo 'en_US.UTF-8 UTF-8' > /etc/locale.gen && locale-gen && update-locale LC_ALL=en_US.UTF-8 LANG=en_US.UTF-8
 
-RUN apt install -y python3-pip
+ENV LANG en_US.UTF-8
+ENV LANGUAGE en_US:en
+ENV LC_ALL en_US.UTF-8
 
 RUN pip3 install youtube_dl
+ADD youtube-dl.conf /etc/youtube-dl.conf
+ADD entrypoint.sh /usr/local/bin/entrypoint.sh
 
-ADD youtube-dl.conf /root/.config/youtube-dl/config
+USER nobody:nogroup
+WORKDIR /tmp
+CMD /bin/bash /usr/local/bin/entrypoint.sh