Feat: Add .rpm build

[dthuerck]

Quick and simple: this uses the pnpm-included functionality to add .rpm builds for the Linux users that do not use Debian derivatives, e.g. for Fedora-people like me.

On this note: thanks you for the great project and keep up the work!

[vercel]

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[greptile-apps]

Greptile Summary

This PR adds .rpm build support for Linux distributions that use RPM packages (Fedora, RHEL, openSUSE, etc.). The changes properly install the rpm tool during the CI build process and configure electron-builder to generate .rpm packages alongside existing AppImage and .deb formats.

• Installs rpm as a system dependency on Ubuntu runner
• Adds rpm as a build target in electron-builder Linux configuration
• Updates GitHub release upload to include .rpm files
• All changes are consistent and properly integrated into the existing workflow

Confidence Score: 5/5

• This PR is safe to merge with no identified risks
• The changes are minimal, focused, and correctly implement .rpm build support. The implementation follows electron-builder conventions and properly integrates with the existing CI/CD pipeline
• No files require special attention

Important Files Changed

Filename	Overview
.github/workflows/release.yml	Added rpm build tool dependency and updated workflow to build and upload .rpm packages
package.json	Added rpm target to electron-builder Linux configuration for x64 architecture

_{Last reviewed commit: 87caa71}