añadiendo permisos sobre la carpeta docker a ver si asi..

Dockerfile

@@ -62,7 +62,7 @@ RUN if ! id -u %USER > /dev/null 2>&1; then \
 RUN echo "---> Make sudo & setup sudoers"
 RUN adduser $USER sudo
 RUN echo "$USER ALL=(ALL) NOPASSWD:ALL" >> /etc/sudoers
-RUN chown -R $USER:$GID docker
+RUN chown -R $USER:$GID $HOME