disable host key checking when installing galaxy roles/collections

see: https://github.com/ansible/awx/issues/5947

awx/playbooks/project_update.yml

@@ -144,6 +144,7 @@
           changed_when: "'was installed successfully' in galaxy_result.stdout"
           environment:
             ANSIBLE_FORCE_COLOR: false
+            GIT_SSH_COMMAND: "ssh -o StrictHostKeyChecking=no"
 
       when: roles_enabled|bool
       tags:
@@ -165,6 +166,7 @@
           environment:
             ANSIBLE_FORCE_COLOR: false
             ANSIBLE_COLLECTIONS_PATHS: "{{ collections_destination }}"
+            GIT_SSH_COMMAND: "ssh -o StrictHostKeyChecking=no"
 
       when:
         - "ansible_version.full is version_compare('2.8', '>=')"