base caas repo root off environment root

Author: sjpb

environments/.caas/hooks/pre.yml

@@ -1,5 +1,15 @@
 ---
 
+- hosts: all
+  become: no
+  gather_facts: no
+  tasks:
+    - debug:
+        msg: |
+          appliances_environment_root: {{ appliances_environment_root }}
+          appliances_repository_root: {{ appliances_repository_root }}
+    - meta: end_here
+
 # Provision the infrastructure using Terraform
 - name: Provision infrastructure
   hosts: openstack

environments/.caas/inventory/group_vars/all/cluster.yml

@@ -1,6 +1,5 @@
 # Account for the fact we are running outside of the expected environment system:
-# NB: this only works for playbooks in ansible/*, not in ansible/adhoc!
-appliances_repository_root: "{{ playbook_dir }}/../"
+appliances_repository_root: "{{ appliances_environment_root + '/../../' | normpath }}"
 
 # Read the secrets from the Ansible local facts on the control host
 vault_azimuth_user_password: "{{ hostvars[groups['control'][0]].ansible_local.openhpc_secrets.vault_azimuth_user_password }}"