builder: added Dockerfile

Dockerfile

@@ -0,0 +1,19 @@
+FROM scratch
+MAINTAINER Nagy Károly Gábriel <nagy.karoly@opensde.org>
+
+ADD files/rootfs.tar.bz2 /
+
+ENV USER builder
+ENV GROUP builder
+ENV HOME /home/${USER}
+
+RUN groupadd -g 1000 ${GROUP}
+RUN useradd -m -s /bin/bash -u 1000 -g ${GROUP} ${USER}
+
+VOLUME ${HOME}
+ENV PATH ${HOME}/bin:${PATH}
+
+USER ${USER}
+WORKDIR ${HOME}
+
+CMD ["/bin/bash"]