Added support for direct helm variables

[sudiptosarkar]

Changes

• Added support for direct helm variables
• Upgraded all upgradable dependencies
• Updated action inputs for the direct helm variable prefix
• Updated documentation for direct helm variable usage
• Added support for multi-chart direct helm variables

Summary

This pull request introduces support for direct Helm variables, allowing users to pass variables directly to Helm charts during deployment, including global variables for all charts. It also updates documentation and configuration to reflect this new feature, and includes improvements to dependency versions and utility functions.

Direct Helm variable support:

• Added support for parsing and passing direct Helm variables using a configurable prefix (HELMVAR by default), including global variables that apply to all charts. This is handled in src/main.ts and described in the updated README.md. [1] [2] [3] [4]
• Updated action.yml to add the directVariablePrefix input, with documentation and environment variable propagation. [1] [2]

Documentation updates:

• Expanded README.md to explain direct Helm variables and global direct variables, including usage examples.

Utility and code improvements:

• Added setDeepValue and objectToYaml functions in src/main.ts to handle complex direct variable paths and convert them to YAML for Helm values files.
• Improved escaping logic in escapeGoSpecialChars to handle file usage and backslashes more robustly. [1] [2]

Dependency updates:

• Updated several development dependencies in package.json to their latest versions, including TypeScript, ESLint, and added npm-check-updates.