build: make inswapper_128.onnx preload optional via INSWAPPER_URL; set INSIGHTFACE_HOME and INSWAPPER_PATH envs

Dockerfile

@@ -109,12 +109,17 @@ RUN mkdir -p /app/uploads/source_images /app/uploads/target_videos /app/uploads/
 # Ensure model cache directory is writable for runtime model downloads
 RUN mkdir -p /app/.assets/models && chown -R user:user /app/.assets
 
-# Preload InsightFace inswapper_128.onnx to avoid runtime 404s
-RUN mkdir -p /home/user/.insightface/models && \
-    curl -fsSL -o /home/user/.insightface/models/inswapper_128.onnx \
-      https://github.com/deepinsight/insightface/releases/download/v0.7/inswapper_128.onnx || \
-    curl -fsSL -o /home/user/.insightface/models/inswapper_128.onnx \
-      https://raw.githubusercontent.com/deepinsight/insightface/refs/tags/v0.7/model_zoo/inswapper_128.onnx && \
+# Optional preload of InsightFace inswapper_128.onnx (skips if no URL provided)
+ARG INSWAPPER_URL=""
+ENV INSIGHTFACE_HOME="/home/user/.insightface"
+ENV INSWAPPER_PATH="/home/user/.insightface/models/inswapper_128.onnx"
+RUN set -e; mkdir -p /home/user/.insightface/models; \
+    if [ -n "$INSWAPPER_URL" ]; then \
+      echo "Downloading inswapper_128.onnx from $INSWAPPER_URL"; \
+      curl -fsSL "$INSWAPPER_URL" -o "$INSWAPPER_PATH" || echo "Warning: download failed, continuing without preloaded model"; \
+    else \
+      echo "No INSWAPPER_URL provided; skipping model download"; \
+    fi; \
     chown -R user:user /home/user/.insightface
 
 # Switch to user (upload directories already created with proper permissions)