[Docker] Add docker imgs with centos 7/8 build env.

docker/builds/DockerfileCentos7

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+FROM centos:7
+MAINTAINER Michal Simon <michal.simon@cern.ch>, CERN, 2015
+
+USER root
+RUN yum install -y epel-release
+RUN yum install -y gcc-c++ rpm-build which git python-srpm-macros centos-release-scl vim
+RUN git clone https://github.com/xrootd/xrootd
+WORKDIR /xrootd/packaging
+RUN ./makesrpm.sh --define "_with_python3 1" --define "_with_tests 1" --define "_with_xrdclhttp 1" --define "_with_scitokens 1" --define "_with_isal 1"
+RUN yum-builddep -y *.src.rpm
+RUN rm -f *src.rpm
+WORKDIR /xrootd/build
+ENTRYPOINT scl enable devtoolset-7 bash
+

docker/builds/DockerfileCentos8

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+FROM centos:8
+MAINTAINER Michal Simon <michal.simon@cern.ch>, CERN, 2015
+
+USER root
+RUN dnf install -y epel-release
+RUN dnf install -y gcc-c++ rpm-build which git python-srpm-macros vim dnf-plugins-core
+RUN dnf config-manager --set-enabled powertools
+RUN git clone https://github.com/xrootd/xrootd
+WORKDIR /xrootd/packaging
+RUN ./makesrpm.sh --define "_with_python3 1" --define "_with_tests 1" --define "_with_xrdclhttp 1" --define "_with_scitokens 1" --define "_with_isal 1"
+RUN dnf builddep -y *.src.rpm
+RUN dnf -y update libarchive
+RUN rm -f *src.rpm
+WORKDIR /xrootd/build
+ENTRYPOINT bash
+

docker/builds/centos7_buildenv.sh

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+#!/bin/bash
+
+docker build -t xrootd/centos7/build - < DockerfileCentos7
+docker run -it --rm xrootd/centos7/build

docker/builds/centos8_buildenv.sh

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+#!/bin/bash
+
+docker build -t xrootd/centos8/build - < DockerfileCentos8
+docker run -it --rm xrootd/centos8/build