Add openSUSE RPM packaging

[egoforth]

Summary

• add a dedicated packaging/package-suse.sh build script
• use openSUSE Qt 6 development packages and RPM conventions
• produce both binary and source RPM artifacts
• document openSUSE dependencies, build usage, and installation

Verification

• bash -n packaging/package-suse.sh
• completed an end-to-end rpmbuild on openSUSE Tumbleweed
• inspected the generated RPM metadata, dependencies, and file list
• installed and ran tux-manager-1.0.7-1.x86_64.rpm successfully on two openSUSE systems

[benapetr]

I just wonder, does this differ from regular .rpm flow? did package-rpm.sh not work under suse? Is there any particular reason to have dedicated packaging script for it?

[egoforth]

At a minimum, openSUSE uses zypper instead of dnf. The existing package-rpm.sh script is Red Hat/Fedora (and derivatives) specific. It should be possible to change the package-rpm.sh script to detect the flavor and change between dnf and zypper. If that approach is preferable, then I would be glad to take that tack.

[cognitus]

In this case, would it be better to use the openSUSE build service?

[egoforth]

Superseded by a unified approach that extends the existing package-rpm.sh workflow instead of adding a dedicated openSUSE script. Thank you for the feedback.