[CI/CD] CI/CD pipeline: Add GitHub Actions workflows for test, build, security scan, and release

[OneByJorah]

CI/CD Pipeline Checklist

• Create for:
  • Lint shell scripts (shellcheck)
  • Lint docker-compose (hadolint)
  • Lint YAML files (yamllint)
  • Run smoke tests ()
  • Run browser-search check ()
  • Security scans (gitleaks, trivy, semgrep)
• Create for:
  • Version bump on tag
  • Generate changelog
  • Create GitHub release
• Create for:
  • Automated dependency updates for npm (browser-search)
  • Automated Docker base image updates
  • Automated GitHub Actions updates
• Add status badges to README.md
• Configure branch protection rules (via repo settings or API)
• Add required status checks for PRs
• Add dependabot alerts and auto-merge for patch updates