feat: add VoIP stack Grafana dashboards and Prometheus targets #264

Job	Run time
Environment File Security	4s
Shell Script Security	5s
Secret Scanning	14s
Dependency Scanning	1m 8s
Trivy Security Scan	28s
Docker Compose Security Review	6s
CodeQL Analysis (Python)	1m 20s
CodeQL Analysis (Go)	1m 58s
Security Summary	4s
	5m 27s

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