build ceph master branch in ubuntu18

Dockerfile

FROM ubuntu:18.04

RUN apt -y update
RUN apt -y install git 
RUN git clone https://github.com/ceph/ceph.git

COPY ./entrypoint.sh /entrypoint.sh
RUN chmod +x /entrypoint.sh
CMD ["./entrypoint.sh"]

entrypoint.sh

#!/bin/bash

cd ceph || exit
git pull
./install-deps.sh || exit
./do_cmake.sh -DBOOST_J="$(nproc)" -DWITH_MGR_DASHBOARD_FRONTEND=OFF -DWITH_SPDK=OFF -DWITH_DPDK=OFF -DWITH_CEPHFS=OFF -DWITH_CCACHE=OFF -DALLOCATOR=libc -DCMAKE_BUILD_TYPE=Debug
cd build || exit
make -j "$(nproc)"