Add build to the CI pipeline.

Let's see if it builds.

.gitlab-ci.yml

@@ -4,3 +4,12 @@ include:
     file: templates/pre-commit.yml
   - project: shore/ci-templates
     file: templates/docker.yml
+
+stages:
+  - test
+  - build
+  - deploy
+
+build:
+  extends: .compose-build
+  tags: [host01.shore.co.il]