Set up docker container for testing and deploiment

Tasks:

• Find Docker image for Pascal compilation
• Configure environment in VScode for working in docker container
• create the gitlab-ci.yml file and use the docker image for pascal compilation
• add a eventually a tag "before_script" to install missing dependencies
• create an "install" job and store the compiled program into an "artifact" folder (See https://docs.gitlab.com/ee/ci/pipelines/job_artifacts.html)
• convert RUNVGEST.BAT in to a bash script
• run the example in the README

See https://docs.gitlab.com/ee/ci/quick_start/ for quick help about gitlab-ci.yml file.