Add Woodpecker CI plugin for Dev Containers

[head1328]

This PR adds a new Woodpecker CI plugin that enables building and running Dev Containers in Woodpecker CI pipelines.

Closes #430

Changes

New Features

• Complete Woodpecker CI plugin implementation
• Docker image with all required dependencies (docker, buildx, skopeo, devcontainer CLI)
• Comprehensive documentation and examples
• Full test coverage with Jest (18 passing tests)
• Local development environment with Forgejo + Woodpecker CI

Plugin Capabilities

• Build Dev Container images with feature support
• Run commands inside containers (run_cmd)
• Multi-platform builds (linux/amd64, linux/arm64)
• Image caching and pushing to registries
• Environment variable passthrough
• Configurable paths and options

Code Quality

• TypeScript with strict mode
• ESLint configuration
• Prettier formatting
• Comprehensive unit tests
• CI pipeline with format-check, lint, build, and integration tests

Documentation

• Complete README with setup instructions
• Plugin marketplace documentation (docs.md)
• Example configurations for common use cases
• Troubleshooting guide

Testing

• All 18 unit tests passing
• Integration tests in CI pipeline
• Tested with multiple Dev Container configurations:
  • Simple Node.js (image-based)
  • Custom Dockerfile
  • Dev Container features
• Local testing with docker-compose (Forgejo + Woodpecker)

Breaking Changes

None - this is a new addition.

[head1328]

@microsoft-github-policy-service agree

[head1328]

It works as described, but due to the lack of dind support, it doesn't work on the Codeberg platform: https://ci.codeberg.org/. However, it is possible to integrate a Woodpecker CI instance or run your own agent. Since I now prefer using EnvBuilder or directly generated devcontainer images via devcontainer --build for my project, I will no longer maintain this plugin. However, you are welcome to merge it, maintain it further, and use it, or we can close the pull request.