Add .gitlab-ci.yml

.gitlab-ci.yml

+image: docker:stable
+services:
+    - docker:dind
+
+variables:
+  DOCKER_HOST: tcp://docker:2375
+  DOCKER_DRIVER: overlay2
+
+
+before_script:
+    - apk --no-cache add python
+
+
+build:
+    script:
+        - python publish_images.py
+    tags:
+        docker