Add new file

.gitlab-ci.yml

+variables:
+  DOCKER_DRIVER: overlay2
+  DOCKER_TLS_CERTDIR: ""
+  DOCKER_VERSION: 19.03.8
+  #Docker version MUST match the version in the runner config.toml
+
+image: docker:$DOCKER_VERSION
+
+services:
+  - docker:$DOCKER_VERSION-dind
+
+before_script:
+  - docker info
+
+build:
+  stage: build
+  script:
+    - docker build --network="host" -t CI_PROJECT_NAME:latest .