I'm using jetty:latest as Baseimage in my Dockerfile (FROM jetty:latest)

I used to modify some parts within the Container with statements in my Dockerfile like:

RUN rm -f /etc/localtime && ln -snf /usr/share/zoneinfo/$TIMEZONE /etc/localtime && echo $TIMEZONE > /etc/timezone

RUN apt-get update && \
    apt-get -y upgrade && \
    apt-get -y install foo bla && \
    apt-get clean
RUN mkdir /somedir

Since the latest version of the Image I get an "permission denied" error when trying to run any of this commands.