Merge branch '13-re-factor-repository-workflow' into 'master'

.gitlab-ci.yml

.gitlabci/setup.sh

.gitlabci/sregistry-gitlab.png

.gitlabci/sregistry-gitlab.xcf

README.md

containers/builder/Makefile

containers/builder/config.env

containers/builder/eic_builder.def

containers/builder/spack.yaml

containers/release/Makefile

containers/release/config.env

containers/release/version.sh

gitlab-ci/build_and_deploy.yml.in

gitlab-ci/configure_pipeline.sh

gitlab-ci/docker/Makefile

gitlab-ci/docker/version-stable.sh

gitlab-ci/docker/version.sh

gitlab-ci/singularity/build.sh

install.py