* refactor(docker): Enhance Zebra configuration options and entrypoint logic
- Introduced multiple methods for configuring Zebra, including custom config file paths and automatic generation from environment variables.
- Updated entrypoint script to handle configuration more robustly, checking for existing files and generating defaults as needed.
- Improved documentation in `docker.md` to clarify configuration options and their precedence.
- Adjusted environment variable handling in `docker/.env` for better clarity and functionality.
- Refactored `prepare_conf_file` to create a complete configuration based on environment variables, streamlining the setup process.
* fix(docker): remove non-essential variables and set correct defaults
* feat(ci): Centralize zebra configuration testing with Docker
- Replace multiple separate test jobs with a single comprehensive matrix-based test
- Create a new ADR documenting the design decision for centralizing Docker tests
- Move all test scenarios from both CI and CD pipelines into a single reusable workflow
- Define extensive test matrix covering network, RPC, directory, feature configurations
- Improve workflow readability with descriptive test names and clear organization
- Simplify workflow inputs to only require the Docker image identifier
* chore(ci): cleanup jobs that already don't exist
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