feat: Encrypt backup artifacts with GPG using AES256 #357

Job	Run time
Security & Code Quality	1m 30s
Test Suite	46s
Build & Performance	5m 41s
Database Tests	59s
Enhanced Security Testing	5m 8s
Deploy to Staging	0s
Deploy to Production	0s
Rollback on Failure	0s
Performance Monitoring (Staging)	0s
Performance Monitoring	0s
	14m 4s

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