- add Vagrantfile to contrib/vms
- add custom provisioning via shell scripts
- move gitlab-ci before_script: to ci/install_dependencies.sh which is also used
by vagrant
- change COPR setup on CentOS 7 (yum-plugin-copr does not seem to work)
- add a GitLab CI configuration file to run a pipeline on the major Linux
distros
- add a build script that builds all build combinations of exiv2 & runs the test
suite