ci: add image for building the app

.gitlab-ci.yml

@@ -0,0 +1,20 @@
+image: registry.gitlab.com/openstapps/projectmanagement/builder
+
+stages:
+  - setup
+
+setup:
+  stage: setup
+  only:
+    - schedules
+  variables:
+    DOCKER_DRIVER: overlay2
+  image: registry.gitlab.com/openstapps/projectmanagement/builder
+  services:
+    - docker:dind
+  script:
+    - docker login -u gitlab-ci-token -p $CI_BUILD_TOKEN registry.gitlab.com
+    - docker build -t registry.gitlab.com/openstapps/app .
+    - docker push registry.gitlab.com/openstapps/app
+  tags:
+    - docker