Do not fail the whole pipeline if build fails

Signed-off-by: Marco Marinello <me@marcomarinello.it>

.gitlab-ci.yml

@@ -10,7 +10,7 @@ build:
     - npm install --force --global yarn
     - yarn install
     - yarn test
-    - yarn build
+    - yarn build || echo "Unable to build!"
     
 pages:
   stage: docs