fix: skip onnx cuda download for cpu image

OpenMAIC/Dockerfile

@@ -9,6 +9,14 @@ WORKDIR /app
 # ---- Stage 2: Dependencies ----
 FROM base AS deps
 
+# The npm package bundles the CPU runtime. Linux/x64 otherwise assumes CUDA 12
+# and downloads CUDA EP packages from NuGet during postinstall; that download
+# is not needed by the CPU ACK images and is fragile behind redirecting proxies.
+# A CUDA build must explicitly pass --build-arg ONNXRUNTIME_NODE_INSTALL=cuda12
+# and use a CUDA-capable runner image; that path is not enabled by default here.
+ARG ONNXRUNTIME_NODE_INSTALL=skip
+ENV ONNXRUNTIME_NODE_INSTALL=$ONNXRUNTIME_NODE_INSTALL
+
 # Native build tools for sharp, @napi-rs/canvas
 RUN apk add --no-cache python3 build-base g++ cairo-dev pango-dev jpeg-dev giflib-dev librsvg-dev