Add .gitlab-ci.yml

Dependencies

• [2] 7AUC4NKI Initial commit

Change contents

• file addition: .gitlab-ci.yml (----------)
  [2.2]
  + stages:

  + - all

  +

  + nix-job:

  + tags:

  + - nix

  + stage: all

  + script:

  + - nix --version

  + - nix show-config

  + - ./demo-full.sh -a

  + - ./demo-full.sh -l