intentando crear como root /var/run/s6 para ver si eso arregla el problema

Dockerfile

@@ -20,6 +20,8 @@ SHELL [ "/bin/bash", "--login", "-c" ]
 ###############
 # Ensure vars #
 ###############
+RUN mkdir /var/run/s6
+
 RUN echo "--> ARGS"
 ARG USER_NAME=user \
     USER_ID=1000 \
@@ -50,7 +52,7 @@ RUN echo "---> Setup volumes"
 COPY --chown=${USER_ID}:${GROUP_ID} ../r_shiny_app $HOME/${USER_NAME}app
 COPY --chown=${USER_ID}:${GROUP_ID} ${LOCAL_DATA_PATH} $HOME/${USER_NAME}data/
 COPY --chown=${USER_ID}:${GROUP_ID} ../dvats ${HOME}/${USER_NAME}/dvats
-
+RUN  chown ${USER_ID}:${GROUP_ID} /var/run/s6
 # Install deepvats
 
 RUN pip install -e  /home/work