CI: make the ansible inventory a directory

Not constraining the inventory to .ini allows us to use dynamic
inventory, which is needed for simplifying kubevirt jobs inventory.

Also reduces the scope of the ANSIBLE_INVENTORY variable.

tests/scripts/testcases_cleanup.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 set -euxo pipefail
 
-cd tests && make delete-${CI_PLATFORM} -s ; cd -
+make -C tests delete-${CI_PLATFORM} -s
 
 if [ -d ~/.ara ] ; then
   tar czvf ${CI_PROJECT_DIR}/cluster-dump/ara.tgz ~/.ara

tests/scripts/testcases_run.sh

@@ -31,8 +31,9 @@ export ANSIBLE_REMOTE_USER=$SSH_USER
 export ANSIBLE_BECOME=true
 export ANSIBLE_BECOME_USER=root
 export ANSIBLE_CALLBACK_PLUGINS="$(python -m ara.setup.callback_plugins)"
+export ANSIBLE_INVENTORY=${CI_PROJECT_DIR}/inventory/sample/
 
-cd tests && make create-${CI_PLATFORM} -s ; cd -
+make -C tests INVENTORY_DIR=${ANSIBLE_INVENTORY} create-${CI_PLATFORM} -s
 ansible-playbook tests/cloud_playbooks/wait-for-ssh.yml
 
 # Flatcar Container Linux needs auto update disabled