update gitlab ci

.gitlab-ci.yml

@@ -8,6 +8,7 @@ build:
   stage: build
   script:
     # dépendances pelican thèmes
+    - apt-get update
     - apt-get install -y --force-yes build-essential python-dev python-pip git nodejs nodejs-legacy npm
     - pip install --upgrade pip==9.0.3
     - pip install -r requirements.txt