Templatize Dockerfiles

.gitlab-ci.yml

1.12/buster/Dockerfile

1.12/buster/docker-entrypoint.sh

1.12/buster/slim/Dockerfile

1.12/buster/slim/docker-entrypoint.sh

1.12/stretch/Dockerfile

1.12/stretch/docker-entrypoint.sh

1.12/stretch/slim/Dockerfile

1.12/stretch/slim/docker-entrypoint.sh

1.12/windowsservercore-1809/Dockerfile

1.12/windowsservercore-ltsc2016/Dockerfile

Dockerfile-apt-nightly.template

Dockerfile-apt-slim-nightly.template

Dockerfile-apt-slim.template

Dockerfile-apt.template

Dockerfile-windowsservercore.template

README.md

README.org

docker-entrypoint.sh

generate-readme.sh