Add Open VSX Registry Publishing Support

[AnishBplayz]

Overview

This PR adds automated publishing to Open VSX Registry alongside the existing Visual Studio Marketplace publishing, making the CfxLua IntelliSense extension available to users of open-source VS Code alternatives like VSCodium and Cursor IDE.

Changes Made

1. GitHub Workflow Updates

• File: .github/workflows/release.yml
• Change: Added Open VSX Registry publishing step after the existing Visual Studio Marketplace publishing
• Benefit: Extension will now be available on both registries automatically

2. Documentation Updates

• File: README.md
• Change: Added note about Open VSX support in the PR
• Benefit: Users understand the extension is available on both registries

Technical Details

Workflow Changes

The workflow now includes two publishing steps:

1. Visual Studio Marketplace (existing functionality)
2. Open VSX Registry (new functionality)

Both steps use the same HaaLeo/publish-vscode-extension@v2 action with different registry URLs.

Required Setup

To enable Open VSX publishing, the following secrets need to be added to the repository:

• OPEN_VSX_TOKEN: Access token from open-vsx.org
• The communityox namespace needs to be created on Open VSX Registry

Benefits

• Broader reach: Extension available to users of VSCodium and other open-source VS Code alternatives
• No breaking changes: Existing Visual Studio Marketplace publishing remains unchanged
• Automated: Both registries are updated automatically on every release

Testing

• Workflow syntax validated
• No breaking changes to existing functionality
• Open VSX publishing step added without affecting VS Marketplace publishing

Notes

• This change is backward compatible
• Existing users will continue to get updates from Visual Studio Marketplace
• New users can choose between either registry
• The same version number is published to both registries

[AnishBplayz]

Closes the issue #1