CI for building and pushing superbuild image

.gitlab-ci.yml

+image: docker:stable
+
+services:
+    - docker:dind
+
+stages:
+    - build
+
+before_script:
+    - docker info
+    - docker login -u $DOCKER_USERNAME -p $DOCKER_PASSWORD
+
+Build image:
+    stage: build
+    script:
+        - docker build -t superfiphoboserver:debian -f ./tools/ci.Dockerfile .
+        - docker tag superfiphoboserver:debian ciaranorourke/fiphoboserver:debian
+        - docker push ciaranorourke/fiphoboserver:debian