CI - add lint stage

.gitlab-ci.yml

@@ -16,6 +16,7 @@ services:
     alias: postgres
 
 stages:
+  - lint
   - tests
   - selenium
 
@@ -28,16 +29,33 @@ stages:
   script:
     - pytest fittrackee -p no:warnings --cov fittrackee --cov-report term-missing
 
-lint:
+
+.javascript:
+  stage: tests
+  before_script:
+    - apt-get update && apt-get install -y nodejs npm
+    - npm install --global yarn
+    - cd fittrackee_client
+    - yarn install
+
+python-lint:
+  stage: lint
   extends: .python
   script:
     - pytest --flake8 --isort --black -m "flake8 or isort or black" fittrackee e2e --ignore=fittrackee/migrations
 
-type-check:
+python-type-check:
+  stage: lint
   extends: .python
   script:
     - mypy fittrackee
 
+eslint:
+  stage: lint
+  extends: .javascript
+  script:
+    - yarn lint
+
 python-3.7:
   extends: .python
   image: python:3.7