ENH: add Docker file and stuff to build the image

.gitlab-ci.yml

docker/Dockerfile

docker/transfer/build_docker/cert.sh

docker/transfer/build_docker/create_server_conf.py

docker/transfer/build_docker/setup.sh

docker/transfer/build_docker/setup_os.sh

docker/transfer/build_docker/sql.config

docker/transfer/run_docker/bin/backup

docker/transfer/run_docker/bin/cert_gen

docker/transfer/run_docker/bin/check_mail

docker/transfer/run_docker/bin/mysqllog

docker/transfer/run_docker/bin/sendmail_to_file

docker/transfer/run_docker/etc/nsswitch.conf

docker/transfer/run_docker/run

docker/transfer/run_docker/utils/src/mail_setup.cpp

docker/transfer/run_docker/utils/src/permission_setup.cpp

docker/transfer/run_docker/utils/src/start_nslcd.cpp

docker/transfer/run_docker/utils/src/tzsetup.cpp

docker/transfer/run_docker/utils/src/ypsetup.cpp

docker/transfer/settings/maven_m2_settings.xml