fix(semaphore): ANSIBLE_ROLES_PATH is relative to repo root not playbook dir

Semaphore runs ansible-playbook from the cloned repo root, not from
the playbook directory. The previous value '../roles' resolved
outside the repo. Correct path is 'ansible/roles'.

ansible/group_vars/all/semaphore.yml

@@ -100,11 +100,10 @@ semaphore_config:
       env:
         ANSIBLE_HOST_KEY_CHECKING: "False"
         ANSIBLE_FORCE_COLOR: "True"
-        # Semaphore runs ansible-playbook from the playbook's directory
-        # (ansible/playbooks/), which doesn't pick up ansible.cfg from
-        # the parent ansible/ dir. Point roles_path at the canonical
-        # location relative to that working directory.
-        ANSIBLE_ROLES_PATH: "../roles"
+        # Semaphore runs ansible-playbook from the cloned REPO ROOT (not
+        # from the playbook's directory as I first assumed). Path is
+        # therefore relative to repo root, not playbook dir.
+        ANSIBLE_ROLES_PATH: "ansible/roles"
 
   templates:
     - name: "day0_linux_baseline"