Merge branch 'develop' into 'master'

.gitlab-ci.yml

README.md

VERSION

containers/builder/Dockerfile

containers/release/configure_release.sh

containers/release/eic.def.in

spack/.gitignore

spack/README.md

spack/packages/acts/package.py

spack/packages/dawn/exec.patch

spack/packages/dawn/install.patch

spack/packages/dawn/package.py

spack/packages/dawncut/install.patch

spack/packages/dawncut/package.py

spack/packages/dd4hep/package.py

spack/packages/dd4hep/tbb-workarounds.patch

spack/packages/dd4hep/tbb2.patch

spack/packages/eicd/package.py

spack/packages/fmt/fmt-attributes-cpp11_4.1.0.patch

spack/packages/fmt/fmt-no-export-cpp11flag_3.0.0.patch