Resolve "Improve gitlab pipelines"

.gitlab-ci.yml

 stages:
-  - server-test
-  - client-install
-  - client-test
+  - setup
+  - test
 
 include:
   - local: .gitlab/server.gitlab-ci.yml

.gitlab/client.gitlab-ci.yml

-image: node:10
-
-install:
-  stage: client-install
+client:setup:
+  image: node:10
+  stage: setup
   script:
     - cd client
     - npm install
   artifacts:
     name: "artifacts"
     untracked: true
-    expire_in: 60 mins
+    expire_in: 15 mins
+    paths:
+      - client/.npm/
+      - client/node_modules/
+  cache:
+    key: "$CI_COMMIT_REF_SLUG"
     paths:
       - client/.npm/
       - client/node_modules/
 
-linting:
-  stage: client-test
+client:linting:
+  image: node:10
+  stage: test
+  needs: ["client:setup"]
   script:
     - cd client
     - npm run lint
-  dependencies:
-    - install
 
-test:unit:
-  stage: client-test
+client:test:
+  image: node:10
+  stage: test
+  needs: ["client:setup"]
   script:
     - cd client
     - npm run test:coverage
-  dependencies:
-    - install
+
   coverage: /All files\s*\|\s*([\d\.]+)/

.gitlab/server.gitlab-ci.yml

-
-
-test-server:
+server:setup:
   image: python
+  stage: setup
+  artifacts:
+    paths:
+      - server/env
+    expire_in: 15 min
+    untracked: true
   cache:
+    key: "$CI_COMMIT_REF_SLUG"
     paths:
-      - server/env/
-  stage: server-test
+      - server/env
   script:
     - python --version
     - pip install virtualenv
@@ -13,4 +17,12 @@ test-server:
     - python -m venv env
     - source env/bin/activate
     - pip install -r requirements.txt
+
+server:test:
+  image: python
+  stage: test
+  needs: ["server:setup"]
+  script:
+    - cd server
+    - source env/bin/activate
     - pytest --cov app tests/