support top level custom keywords starting with "x-"

[kindermax]

• "x-" prefixed top level keywords are now supported. This allows alias this data in env
• env can now alias "x-" prefixed maps which will be merged with "env"
• improve docs - sidebar now has better nesting
• improve docs - add conditional "init" explanation
• add bats and unit tests

Summary by Sourcery

Add support for top-level custom keywords starting with "x-" and improve YAML aliasing for environment variables

New Features:

• Support for top-level custom keywords prefixed with 'x-'
• Add YAML alias support for environment variables

Enhancements:

• Improve documentation structure and content
• Add validation for top-level keywords in config

Documentation:

• Update sidebar structure
• Add detailed explanation of conditional init
• Update changelog with new features

Tests:

• Add bats and unit tests for new features
• Add tests for env aliasing and keyword validation

[sourcery-ai]

Reviewer's Guide

This pull request introduces support for custom top-level configuration keys prefixed with x- and enables YAML aliasing for env blocks. Config parsing was updated to allow x- prefixed keys, and the env unmarshalling logic now handles the YAML merge key (<<:) to incorporate aliased maps. Documentation and tests were added for the new features.

File-Level Changes

Change	Details	Files
Added support for x- prefixed top-level keywords and validation for unknown keywords.	Modified config unmarshalling to allow top-level keys starting with x-. Added validation to reject unknown top-level keywords not starting with x-. Added unit test for invalid keyword detection.	config/config/config.go config/config/config_test.go
Enabled YAML merge key (<<:) support for merging aliased maps into env blocks.	Updated Envs unmarshalling to detect the YAML merge key (!!merge). Implemented logic to recursively unmarshal and merge aliased environment maps. Added unit tests for env merging. Added BATS tests for global and command-level env merging with aliases.	config/config/env.go config/config/config_test.go tests/global_env.bats tests/command_env.bats tests/global_env/lets.aliased-env.yaml tests/command_env/lets.aliased-env.yaml
Improved documentation structure and content.	Refactored sidebars.js for better nesting. Added documentation for env aliasing. Added documentation explaining a pattern for conditional init execution. Updated changelog.	docs/sidebars.js docs/docs/config.md docs/docs/best_practices.md docs/docs/changelog.md

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[sourcery-ai]

Hey @kindermax - I've reviewed your changes - here's some feedback:

• Consider splitting the documentation refactoring (sidebar structure, config table of contents) into a separate PR from the x- keyword and env aliasing feature.

Here's what I looked at during the review

• 🟡 General issues: 9 issues found
• 🟢 Security: all looks good
• 🟡 Testing: 2 issues found
• 🟢 Documentation: all looks good

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