Avoid the macOS case-insensitive app/CLI build collision

scripts/release-desktop-app.sh

@@ -21,11 +21,11 @@ FYNE="$(command -v fyne || true)"
 IDENT="$(security find-identity -v -p codesigning | awk '/Developer ID Application:/{print $2; exit}')"
 [ -n "$IDENT" ] || { echo "no Developer ID Application identity"; exit 1; }
 
-mkdir -p "$OUT"
-go build -o .local/Tunnel -ldflags "-X main.version=$VERSION" ./cmd/tunnel-desktop
+mkdir -p "$OUT" .local/desktop
+go build -o .local/desktop/Tunnel -ldflags "-X main.version=$VERSION" ./cmd/tunnel-desktop
 rm -rf "$APP"
 "$FYNE" package -os darwin \
-  -executable .local/Tunnel \
+  -executable .local/desktop/Tunnel \
   -name Tunnel -app-id dev.tzgyn.tunnel \
   -app-version "$VERSION" -app-build "$BUILD" \
   -icon assets/icon.png -release