singularity recipe for CentOS-7 builder

singularity/CentOS-7-release-builder/README.md

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+building the container:
+```
+sudo singularity build CentOS-7-release-builder.simg Singularity 
+```
+
+running it to build the rpm/deb
+```
+export OUT=`mktemp -d` && echo building in ${OUT} && \
+singularity run -H ${OUT}  CentOS-7-release-builder.simg
+```
+
+use the container to build another version:
+```
+export OUT=`mktemp -d` && echo building in ${OUT} && \
+singularity exec -H ${OUT}  CentOS-7-release-builder.simg bash -c "wget https://github.com/truatpasteurdotfr/barrier/archive/v2.0.0-RC2.tar.gz   && rpmbuild -ta v2.0.0-RC2.tar.gz"
+
+```
+

singularity/CentOS-7-release-builder/Singularity

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+BootStrap: docker
+From: centos:centos7
+
+%post
+yum -y update && yum -y upgrade
+yum -y install epel-release
+yum -y install cmake3 make qt5-qtbase-devel gcc \
+ avahi-compat-libdns_sd-devel gcc-c++ curl-devel \
+ openssl-devel \
+ libXtst-devel libXinerama-devel libICE-devel libXrandr-devel \
+ wget rpm-build alien fakeroot
+# using aline for a quick and dirty conversion to debian, should be ok for stretch amd64 
+
+%runscript
+# during the testing period using truatpasteurdotfr/barrier pre-released tarball
+# final version should use the https://github.com/debauchee/barrier release versions
+
+D=`mktemp -d`
+echo '***' && \
+echo "building in $D" && \
+echo '***' 
+cd $D && \
+
+wget https://github.com/truatpasteurdotfr/barrier/archive/v2.0.0-RC2.tar.gz  && \
+( rpmbuild -ta v2.0.0-RC2.tar.gz ) | tee rpmbuild.log && \
+fakeroot alien -d ~/rpmbuild/RPMS/x86_64/barrier-2.0.0-1.el7.centos.x86_64.rpm  && \
+tar czvf rpmbuild.tgz rpmbuild.log ~/rpmbuild/{RPMS,SRPMS} barrier*.deb && \
+echo '***' && \
+echo results in $D
+echo '***'
+
+