fix: deployment success message now shows correct domains for each environment

- Replace hardcoded test.local domains in show_connection_info() function
- Use ${TRACKER_DOMAIN:-tracker.test.local} and ${GRAFANA_DOMAIN:-grafana.test.local}
- Staging deployments now correctly show tracker.torrust-demo.dev and grafana.torrust-demo.dev
- Local deployments maintain backward compatibility with test.local fallbacks
- Follows up on SSL certificate domain fix (commit 74e4c7e)

Testing:
- Validated staging deployment shows tracker.torrust-demo.dev domains
- Maintains fallback behavior for local environments
- All 14 hardcoded test.local references now use environment variables

Author: josecelano

infrastructure/scripts/deploy-app.sh

@@ -1098,18 +1098,18 @@ show_connection_info() {
     echo "Grafana HTTPS:        https://${vm_ip}:3100 (expect certificate warning)" # DevSkim: ignore DS137138
     echo
     echo "=== DOMAIN-BASED HTTPS (add to /etc/hosts for testing) ==="
-    echo "Tracker API:          https://tracker.test.local (requires hosts entry)"
-    echo "Grafana:              https://grafana.test.local (requires hosts entry)"
+    echo "Tracker API:          https://${TRACKER_DOMAIN:-tracker.test.local} (requires hosts entry)"
+    echo "Grafana:              https://${GRAFANA_DOMAIN:-grafana.test.local} (requires hosts entry)"
     echo
     echo "=== SETUP FOR HTTPS TESTING ==="
     echo "Add these lines to your /etc/hosts file:"
-    echo "${vm_ip} tracker.test.local"
-    echo "${vm_ip} grafana.test.local"
+    echo "${vm_ip} ${TRACKER_DOMAIN:-tracker.test.local}"
+    echo "${vm_ip} ${GRAFANA_DOMAIN:-grafana.test.local}"
     echo
     echo "Then access:"
-    echo "• Tracker API:   https://tracker.test.local/health_check"
-    echo "• Tracker Stats: https://tracker.test.local/api/v1/stats?token=${TRACKER_ADMIN_TOKEN:-MyAccessToken}"
-    echo "• Grafana Login: https://grafana.test.local (admin/admin)"
+    echo "• Tracker API:   https://${TRACKER_DOMAIN:-tracker.test.local}/health_check"
+    echo "• Tracker Stats: https://${TRACKER_DOMAIN:-tracker.test.local}/api/v1/stats?token=${TRACKER_ADMIN_TOKEN:-MyAccessToken}"
+    echo "• Grafana Login: https://${GRAFANA_DOMAIN:-grafana.test.local} (admin/admin)"
     echo
     echo "Note: Your browser will show a security warning for self-signed certificates."
     echo "      Click 'Advanced' -> 'Proceed to site' to continue."