Fix RPM build paths in Linux workflow

Updated the build-linux.yml workflow to use absolute paths for the desktop file and icon during RPM packaging, ensuring correct file installation regardless of the build directory structure.

.github/workflows/build-linux.yml

@@ -214,7 +214,8 @@ jobs:
         # Build RPM manually with proper spec file
         version="${{ steps.get_version.outputs.VERSION }}"
         arch_uname="${ARCH}"
-        build_dir_abs="$(pwd)/${build_dir}"
+        workspace_root="$(pwd)"
+        build_dir_abs="${workspace_root}/${build_dir}"
         
         # Create custom RPM spec file that doesn't auto-detect dependencies
         mkdir -p build/rpm/{BUILD,RPMS,SOURCES,SPECS,SRPMS}
@@ -259,8 +260,8 @@ jobs:
         chmod 0755 %{buildroot}/usr/bin/ytsage
         
         # Install desktop file and icon
-        install -m 0644 ${build_dir_abs}/../../../ytsage.desktop %{buildroot}/usr/share/applications/ytsage.desktop
-        install -m 0644 ${build_dir_abs}/../../../assets/branding/icons/icon.png %{buildroot}/usr/share/pixmaps/ytsage.png
+        install -m 0644 ${workspace_root}/ytsage.desktop %{buildroot}/usr/share/applications/ytsage.desktop
+        install -m 0644 ${workspace_root}/assets/branding/icons/icon.png %{buildroot}/usr/share/pixmaps/ytsage.png
         
         %files
         /opt/ytsage