Trigger libvirt_manager molecule on config_drive changes

[cjeanner]

Since config_drive is used in the libvirt_manager, we want to ensure
it's still properly working.

Also, moving the config_drove workdir to the standard "artifacts" tree,
ensuring we gather the content from the jobs.

[openshift-ci]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[softwarefactory-project-zuul]

Build failed (check pipeline). Post recheck (without leading slash)
to rerun all jobs. Make sure the failure cause has been resolved before
you rerun jobs.

https://softwarefactory-project.io/zuul/t/rdoproject.org/buildset/397643ec757b485a914a1213091147c9

✔️ openstack-k8s-operators-content-provider SUCCESS in 1h 41m 32s
✔️ podified-multinode-edpm-deployment-crc SUCCESS in 1h 19m 48s
✔️ cifmw-crc-podified-edpm-baremetal SUCCESS in 1h 25m 01s
✔️ noop SUCCESS in 0s
✔️ cifmw-pod-ansible-test SUCCESS in 7m 18s
✔️ cifmw-pod-pre-commit SUCCESS in 7m 33s
✔️ cifmw-pod-zuul-files SUCCESS in 4m 01s
✔️ build-push-container-cifmw-client SUCCESS in 21m 49s
✔️ cifmw-molecule-config_drive SUCCESS in 9m 28s
❌ cifmw-molecule-libvirt_manager FAILURE in 22m 02s

[cescgina]

/approve

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cescgina

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[cjeanner]

recheck

[raukadah]

/lgtm

[hjensas]

/lgtm