Fixes 4775: add weekly cron for pulp orphan cleanup #877

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Status	Duration	Name
✅ Succeeded	6 seconds	init
✅ Succeeded	15 seconds	clone-repository
✅ Succeeded	2 minutes	build-container
✅ Succeeded	12 seconds	build-image-index
✅ Succeeded	11 seconds	deprecated-base-image-check
✅ Succeeded	12 seconds	apply-tags
✅ Succeeded	50 seconds	clamav-scan
✅ Succeeded	25 seconds	clair-scan
✅ Succeeded	23 seconds	sast-snyk-check
✅ Succeeded	54 seconds	push-dockerfile
✅ Succeeded	15 seconds	ecosystem-cert-preflight-checks
✅ Succeeded	9 seconds	rpms-signature-scan
✅ Succeeded	12 seconds	show-summary
✅ Succeeded	8 seconds	show-sbom