Added GitLab CI for proxy images.

.gitignore

+# cache directories
+*Thumbs.db
+*.DS_Store
+*.empty
+
+# phpstorm, netbeans, zend studio, eclipse project files
+.idea
+nbproject
+.buildpath
+.project
+.settings

.gitlab-ci.yml

+include:
+    -   project: 'it/policies-procedures-standards'
+        file: '/includes/ci/proxy-deploy.yml'
+
+stages:
+    - proxy-image
+
+.service_image: &service_image
+    services:
+        - name: gitlab.itsupportme.by:5005/docker-images/docker:18-dind
+          alias: docker
+
+.scheduled_builds: &scheduled_builds
+    only:
+        refs:
+            - master
+            - main
+        variables:
+            - $WEEKLY_BUILD != null
+    when: on_success
+
+### Jobs
+18-04: &18_04
+    extends: .build_proxy_image
+    <<: *service_image
+    variables:
+        DOCKER_IMAGE: ubuntu
+        DOCKER_TAG: "18.04"
+
+20-04: &20_04
+    extends: .build_proxy_image
+    <<: *service_image
+    variables:
+        DOCKER_IMAGE: docker
+        DOCKER_TAG: "20.04"
+
+### Weekly Jobs
+18-04-weekly:
+    <<: *18_04
+    <<: *scheduled_builds
+
+20-04-weekly:
+    <<: *20_04
+    <<: *scheduled_builds

README.md

+This is proxy of the Ubuntu. 
+See the [Ubuntu DockerHub Page](https://hub.docker.com/_/ubuntu) for the full readme on how to use this Docker image 
+and for information regarding contributing and issues.