Add cachi2 artifact to rpm-ostree OCI-TA Task #1517

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Status	Duration	Name
✅ Succeeded	21 seconds	fetch-repository
✅ Succeeded	3 minutes	ec-task-checks
✅ Succeeded	10 seconds	check-task-migration-md
✅ Succeeded	16 seconds	sast-snyk-check
✅ Succeeded	11 seconds	task-lint-check
✅ Succeeded	2 minutes	build-container
✅ Succeeded	5 minutes	sast-unicode-check
✅ Succeeded	3 minutes	build-bundles
✅ Succeeded	4 minutes	check-partner-tasks
✅ Succeeded	48 seconds	check-task-pipeline-repo-existence
✅ Succeeded	17 minutes	e2e-tests
✅ Succeeded	6 seconds	e2e-cleanup