package a python app using virtualenv into rpm with fpm on centos 7

Dockerfile.packaging

FROM centos:7
WORKDIR /usr/src/app
RUN yum -y install epel-release && \
    yum -y install \
        automake \
        gcc \
        gcc-c++ \
        make \
        python2-devel \
        python2-pip \
        rpm-build \
        ruby \
        ruby-devel \
        rubygems && \
    yum clean all && \
    gem install --no-rdoc --no-ri fpm
RUN pip install virtualenv virtualenv-tools && rm -rf /.cache/pip
COPY setup.py /usr/src/app/
COPY myapp /usr/src/app/myapp
CMD fpm --verbose --name myapp -s virtualenv -t rpm --prefix /opt/myapp .