ci: add workflow_dispatch trigger for manual runs #15

Job	Run time
Validate Configuration	10s
Lab 04 — Nextcloud SSO Integration (Keycloak OIDC)	4m 50s
Security Scan	32s
Lab 03 - Nextcloud Advanced (cron, resource limits, Redis policy)	1m 7s
Lab 05 — INT-02 Nextcloud+Keycloak OIDC, LDAP sync, user_oidc, WebDAV + INT-13 Nextcloud↔Suit...	4m 44s
Lab 06 -- Nextcloud Production Deployment (resource limits + metrics)	4m 39s
Lab 02 — Nextcloud LAN (PG, Redis, pgsql backend, Redis config)	1m 12s
Lab 01 — Nextcloud standalone (status.php, occ, WebDAV)	40s
	17m 54s

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