fix(ci): add --user flag to flatpak remote-add command

Author: farion1231

.github/workflows/release.yml

@@ -287,7 +287,7 @@ jobs:
           if [ -n "$DEB" ]; then
             echo "Building Flatpak bundle from .deb..."
             cp "$DEB" flatpak/cc-switch.deb
-            flatpak remote-add --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo
+            flatpak remote-add --user --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo
             flatpak install -y --user flathub org.gnome.Platform//46 org.gnome.Sdk//46
             flatpak-builder --force-clean --user --disable-cache --repo flatpak-repo flatpak-build flatpak/com.ccswitch.desktop.yml
             NEW_FLATPAK="CC-Switch-${VERSION}-Linux.flatpak"