add Dockerfile, CI/CD, and README

[krakenhavoc]

This pull request introduces the initial release setup for the KrakenKey Probe project, establishing its build, test, release, and deployment infrastructure. It adds CI/CD workflows, Docker and Compose support, release automation, licensing, and comprehensive documentation for users and contributors.

CI/CD and Release Automation

• Added GitHub Actions workflows for continuous integration (ci.yaml) and automated releases on tag pushes (release.yaml), including linting, testing, building, and artifact management. [1] [2]
• Introduced goreleaser.yaml to automate multi-platform builds, archive packaging, Docker image creation, and publishing to GitHub Container Registry, with manifest generation for easy multi-architecture pulls.

Containerization and Deployment

• Created a production-ready Dockerfile using Go and Distroless, supporting environment configuration and volume mounts for probe state, and exposing the health endpoint.
• Added docker-compose.yaml for simple local deployment, including persistent state volume and environment variable configuration.

Documentation and Licensing

• Added a detailed README.md covering usage, configuration, deployment (Docker, Compose, Kubernetes), troubleshooting, and probe operation, with API key setup and health endpoint details.
• Introduced the AGPLv3 license in LICENSE for open-source compliance.