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+- start the virtualbox VM "c7-gitlab"
+- add build tools
+- build the singularity release rpm
+- install singularity
+- play with it (ie required sudo privileges for the gitlab inside the VM for 2.2 series, might change later):
+ - bootstrap from docker: alpine debian:jessie centos:7
+ - bootstrap from yum: centos:7
+- artifact -> push the built rpm
+