Update gitlab-ci to split frontend and backend

.gitlab-ci.yml

@@ -6,14 +6,21 @@ stages:
 - build
 
 variables:
-  IMAGE: registry.gitlab.com/$CI_PROJECT_PATH
+  IMAGE_FRONTEND: "registry.gitlab.com/$CI_PROJECT_PATH/frontend:$CI_COMMIT_REF_SLUG"
+  IMAGE_BACKEND: "registry.gitlab.com/$CI_PROJECT_PATH/backend:$CI_COMMIT_REF_SLUG"
+
 
 before_script:
   - docker login -u gitlab-ci-token -p $CI_JOB_TOKEN registry.gitlab.com
 
-build:
+build-frontend:
   stage: build
   script:
-    - docker build --pull -t $IMAGE:master .
-    - docker push $IMAGE:master
+    - docker build --pull -t "$IMAGE_FRONTEND":master -f frontend/Dockerfile frontend/
+    - docker push "$IMAGE_FRONTEND"
 
+build-backend:
+  stage: build
+  script:
+    - docker build --pull -t "$IMAGE_BACKEND" -f backend/Dockerfile backend/
+    - docker push "$IMAGE_BACKEND"