Add CI config

.gitlab-ci.yml

+
+stages:
+  - build_src
+  - build_pkg
+  - upload
+
+build:src:
+  stage: build_src
+  image: "ai/build:stretch"
+  script: "build-dsc"
+  artifacts:
+    paths:
+      - build-deb/
+  only:
+    - master
+
+build:pkg:
+  stage: build_pkg
+  image: "ai/build:stretch"
+  script: "build-deb"
+  dependencies:
+    - build:src
+  artifacts:
+    paths:
+      - output-deb/
+  only:
+    - master
+
+upload:pkg:
+  stage: upload
+  image: "ai/pkg:base"
+  script: "upload-packages -r ai3"
+  dependencies:
+    - build:pkg
+  only:
+    - master
+