gitlab: allows failure for Python 3 on 18.04

.gitlab-ci.yml

@@ -117,6 +117,7 @@ robotpkg-py-pinocchio-py3-16.04-debug:
 
 robotpkg-py-pinocchio-py3-18.04-release:
   <<: *robotpkg-py-pinocchio
+  allow_failure: true
   image: eur0c.laas.fr:5000/stack-of-tasks/pinocchio/py-pinocchio-py3:18.04
 
 robotpkg-py-pinocchio-18.04-release:
@@ -132,6 +133,7 @@ robotpkg-py-pinocchio-18.04-debug:
 robotpkg-py-pinocchio-py3-18.04-debug:
   <<: *robotpkg-py-pinocchio
   image: eur0c.laas.fr:5000/stack-of-tasks/pinocchio/py-pinocchio-py3:18.04
+  allow_failure: true
   before_script:
     - echo PKG_OPTIONS.py-pinocchio=debug >> /opt/openrobots/etc/robotpkg.conf