DEB package for Debian/Ubuntu

[vmvarela]

Description

Create a .deb package so Debian/Ubuntu users can install sql-pipe via dpkg -i or from a PPA/APT repository.

Acceptance Criteria

• Generate .deb packages for amd64 and arm64 architectures
• Package includes the binary, man page, and license
• Package metadata is correct (name, version, description, maintainer, homepage)
• Installation via dpkg -i sql-pipe_<version>_<arch>.deb works
• .deb artifacts are uploaded to GitHub Releases by the CI workflow
• README updated with DEB installation instructions

Notes

• Consider using zig build output + dpkg-deb --build or a tool like nfpm to generate the package
• The man page is already built as sql-pipe.1.gz in the release workflow
• Packages should follow Debian naming conventions: sql-pipe_<version>_<arch>.deb