refactor: change gitlab ci option for branches

Dockerfile

@@ -2,7 +2,7 @@ FROM centos:centos7
 MAINTAINER Fabrice Allain <fabrice.allain@pasteur.fr>
 
 RUN yum install -y epel-release
-RUN yum install -y python2-pip python-devel gcc make git
+RUN yum install -y python2-pip python-devel gcc gcc-c++ make git
 RUN curl --silent --location https://rpm.nodesource.com/setup_8.x | bash -; yum -y install nodejs
 
 RUN npm install -g --save-dev @commitlint/{cli,config-conventional}; npm install -g conventional-changelog-cli