feat: Cosign Integration for Container Image Signing in Compage

[azar-intelops]

Problem:
Manual signing processes introduce complexity, potential security risks, and overhead for developers.

Solution:
Integrate Cosign into Compage to enable seamless container image signing. This integration will enhance security, establish trust, and simplify the signing process.

Benefits:

• Enhanced Security: Signed container images provide assurance of their origin and integrity, mitigating the risk of deploying compromised or unauthorized images.
• Trustworthy Deployments: Establish trust in the supply chain by verifying signed images, enabling confident deployments.
• Developer Efficiency: Simplified signing process reduces overhead and complexity, allowing developers to focus on code development