Add Linux AppImage build entrypoint and npm script

[ritz123]

Ship build-appimage.sh, package-appimage.sh, and .nvmrc-aware ensure-nvm-node so a single command can produce a deployable AppImage; document it in BUILD.md.

[Copilot]

Pull request overview

Note

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Adds a Linux AppImage packaging workflow to build a single-file Code - OSS artifact from an existing desktop build output.

Changes:

• Introduces scripts/package-appimage.sh to stage an AppDir and run appimagetool to produce an AppImage
• Adds scripts/ensure-nvm-node.sh to prefer the .nvmrc Node version for packaging scripts
• Wires up npm run package-linux-appimage, plus a small wrapper script and brief BUILD docs

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
scripts/package-appimage.sh	New AppImage packaging script (staging, desktop/AppRun setup, tool download, build output)
scripts/ensure-nvm-node.sh	New helper to source NVM and put the .nvmrc Node version first on PATH
package.json	Adds an npm script entry to run the AppImage packaging script
build-appimage.sh	Adds a repo-root wrapper to run the npm packaging script
BUILD.md	Documents how to invoke the AppImage build

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