Rpm: automate rpm building with build-rpm

builder/dockerfile.centos_core.rpm.build

@@ -1,10 +1,12 @@
 FROM centos:centos7
 
 RUN yum install -y rpm* gpg* rng-tools
+RUN yum install -y tree vim less
+RUN yum install -y redhat-lsb-core
+
+COPY centos/*.spec /tmp
+RUN yum-builddep -y /tmp/*.spec
 
 RUN useradd -m docker && echo "docker:docker" | chpasswd
 
-COPY . /src
-RUN chown -R docker:docker /src
-
 USER docker