check if testinfra works if we disable host key verification in ansible.cfg

.gitlab-ci.yml

@@ -84,7 +84,10 @@ testinfra:
     - eval $(ssh-agent -s)
     - echo "$SSH_PRIVATE_KEY" | tr -d '\r' | ssh-add - > /dev/null
     - cd test/
-    - export ANSIBLE_HOST_KEY_CHECKING=False
+    # it seems testinfra does not respect this environment variable, but if we
+    # set host_key_checking = False in the ansible.cfg it should work
+    # - export ANSIBLE_HOST_KEY_CHECKING=False
+    - echo "host_key_checking = False" >> ansible.cfg
     - py.test -v -m 'testinfra' --connection=ansible --ansible-inventory=../clusters/ci-$CI_PIPELINE_ID/inventory.yml --hosts='ansible://*'
   only:
     changes: