Add molecule test for role

Only test default installation with jbig2enc and sqlite

.travis.yml

@@ -33,6 +33,16 @@ jobs:
         - ng build --prod
       after_success: true
 
+    - name: "Ansible role"
+      sudo: required
+      services:
+        - docker
+      install:
+        - python3 -m pip install molecule[ansible,docker]
+      script:
+        - cd ansible/
+        - molecule test
+      after_success: true
 
 before_install:
   - sudo apt-get update -qq