Migrate GitLab CI to GitHub Actions

[martypitt]

Migrated .gitlab-ci.yml configuration to GitHub Actions workflows:

• ci.yml: Main CI/CD pipeline with build, test, and Docker publishing

  • Builds JVM projects with Maven
  • Builds Orbital UI and Playground UI with Node.js
  • Publishes multi-platform Docker images (amd64, arm64)
  • Different behavior for feature branches, develop, and releases

• verify.yml: Security scanning and validation

  • Trivy container scanning on develop branch
  • License compliance validation
  • Regression tests (manual)

• release.yml: Manual release workflow

  • Gitflow-based major/minor/patch releases

• publish-core-types.yml: Publishes core types to GitHub

Key features:

• Multi-platform Docker builds (linux/amd64, linux/arm64)
• Version verification for tagged releases
• Artifact caching for Maven and npm
• Test result reporting
• Branch-specific deployment strategies

See .github/GITHUB_ACTIONS_MIGRATION.md for detailed migration guide and required secrets configuration.

🤖 Generated with Claude Code