Ensure AIOs are only cleaned up after 6 hours

AIO upgrade jobs on SMS regularly exceed 3 hours, so can be culled
before they are finished. This commit ensures they are only removed
after 6 hours.

Author: Alex-Welsh

.github/workflows/stackhpc-ci-cleanup.yml

@@ -40,10 +40,10 @@ jobs:
         run: |
           pip install python-openstackclient -c https://raw.githubusercontent.com/stackhpc/requirements/refs/heads/stackhpc/${{ steps.openstack_release.outputs.openstack_release }}/upper-constraints.txt
 
-      - name: Clean up aio instances over 3 hours old
+      - name: Clean up aio instances over 6 hours old
         run: |
           result=0
-          changes_before=$(date -Imin -d -3hours)
+          changes_before=$(date -Imin -d -6hours)
           for status in ACTIVE BUILD ERROR SHUTOFF; do
               for instance in $(openstack server list --tags skc-ci-aio --os-compute-api-version 2.66 --format value --column ID --changes-before $changes_before --status $status); do
                   echo "Cleaning up $status instance $instance"