docs: Add Docker wiki reference to CONTRIBUTING.md#181
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Link to the Docker Development Environment wiki page for testing against legacy Ruby versions (2.3, 2.4, 2.5).
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Add link to the Docker Development Environment wiki page for testing against legacy Ruby versions.
The wiki page provides setup instructions and examples for testing on Ruby 2.3, 2.4, and 2.5 using Docker, without needing to install those versions locally.
Useful for debugging version-specific syntax issues like Ruby 2.3 block parameter parsing.
https://github.com/fastruby/next_rails/wiki/Docker-Development-Environment-for-Old-Ruby-Versions