Add preview.localhost to /etc/hosts for devstack and jenkins workers

playbooks/roles/jenkins_worker/tasks/system.yml

@@ -44,3 +44,8 @@
 - name: Add github.com to known_hosts if it does not exist
   shell: >
      ssh-keygen -f {{ jenkins_home }}/.ssh/known_hosts -H -F github.com | grep -q found || ssh-keyscan -H github.com > {{ jenkins_home }}/.ssh/known_hosts
+
+# Edit the /etc/hosts file so that the Preview button will work in Studio
+- name: add preview.localhost to /etc/hosts
+  shell: sed -i -r 's/^127.0.0.1\s+.*$/127.0.0.1 localhost preview.localhost/' /etc/hosts
+  sudo: yes

playbooks/roles/local_dev/tasks/main.yml

@@ -63,3 +63,8 @@
     owner={{ item.user }} mode=755
   with_items: localdev_accounts
   ignore_errors: yes
+
+# Edit the /etc/hosts file so that the Preview button will work in Studio
+- name: add preview.localhost to /etc/hosts
+  shell: sed -i -r 's/^127.0.0.1\s+.*$/127.0.0.1 localhost preview.localhost/' /etc/hosts
+  sudo: yes