ci: added Dockerfile and github build and image push workflow and semver

[ShubhranshuSanjeev]

Summary by CodeRabbit

Release Notes

• Chores
  • Established Docker containerization with optimized builds for deployment
  • Introduced automated CI/CD pipeline for continuous testing and Docker image publishing
  • Configured automated version management and changelog generation for releases
  • Updated build configuration to streamline dependency management

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Walkthrough

This PR adds containerization and automated release infrastructure for a Rust monorepo project, including Docker build configuration, CI/CD pipelines for testing and image building, release automation with version bumping and GitHub releases, and conventional commit validation via Cocogitto.

Changes

Cohort / File(s)	Summary
Docker Configuration .dockerignore, Dockerfile	Adds multi-stage Dockerfile for building Rust binaries with dependency caching and a .dockerignore file to exclude development artifacts and generated directories.
GitHub Actions CI Pipeline .github/workflows/ci.yml	Implements automated CI workflow for linting conventional commits and building/publishing Docker images to GHCR for kronos-api and kronos-worker on push and pull request events.
GitHub Actions Release Pipeline .github/workflows/release.yml	Adds manual release workflow that bumps versions via Cocogitto, builds/pushes Docker images with version tags, and creates GitHub releases with auto-generated changelogs.
Release Configuration cog.toml	Configures Cocogitto for automated versioning, tag management, and monorepo package declaration for kronos-api, kronos-worker, and kronos-common.
Dependency Cleanup crates/common/Cargo.toml	Removes unused cron.workspace = true dependency from the common crate.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~15 minutes

Poem

🐰 The docker containers are now built with care,
CI pipelines dance through the GitHub air,
Versions bump automatically, releases take flight,
The infrastructure blooms—a magnificent sight! 🚀

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