Github actions: provide 256x256 icon files for SDL .deb packages

The merge of the compyx/desktop-icons branch broke the application icons for
the SDL .deb packages, this *should* fix that.


git-svn-id: https://svn.code.sf.net/p/vice-emu/code/trunk@45494 379a1393-f5fb-40a0-bcee-ef074d9b53f7

vice/build/github-actions/build-deb.sh

@@ -75,6 +75,9 @@ if [ "$UI" = "gtk3" ]; then
                 ${DEB_DIR}/usr/share/icons/hicolor/${size_}x${size_}/apps/vice-${name}.png
         done
     done
+elif [ "$UI" = "sdl1" -o "$UI" = "sdl2" ];
+    # Copy icon files
+    cp vice/data/common/vice-*_256.png ${DEB_DIR}/usr/share/vice/common/
 fi
 
 # Create copyright file, taking contributor info from src/infocontrib.h