Add build-time Nginx proxy test

Dockerfile

@@ -12,6 +12,8 @@ RUN apt-get update && apt-get install -y \
     libx11-dev \
     libxrender1 \
     nginx \
+    curl \
+    netcat \
     && rm -rf /var/lib/apt/lists/*
 
 # Create matplotlib config directory with proper permissions
@@ -30,7 +32,7 @@ ENV OCP_VSCODE_LOCK_DIR=/tmp/ocpvscode
 COPY . .
 
 # Set up startup script with correct permissions
-RUN chmod +x start.sh
+RUN chmod +x start.sh test_nginx.sh
 
 # Configure Nginx with proper permissions
 RUN mkdir -p /var/lib/nginx/body && \
@@ -47,6 +49,44 @@ RUN mkdir -p /var/lib/nginx/body && \
     chmod -R 755 /var/log/nginx && \
     chmod -R 755 /run/nginx
 
+# Create a test script for build-time verification
+RUN echo '#!/bin/bash\n\
+echo "Starting test server on port 7861..."\n\
+python3 -m http.server 7861 &\n\
+SERVER_PID=$!\n\
+\n\
+echo "Starting test server on port 3939..."\n\
+python3 -m http.server 3939 &\n\
+VIEWER_PID=$!\n\
+\n\
+echo "Starting nginx..."\n\
+nginx\n\
+\n\
+echo "Waiting for servers to start..."\n\
+sleep 2\n\
+\n\
+echo "Testing main app proxy..."\n\
+MAIN_STATUS=$(curl -s -o /dev/null -w "%{http_code}" http://localhost:7860/)\n\
+echo "Main app status: $MAIN_STATUS"\n\
+\n\
+echo "Testing viewer proxy..."\n\
+VIEWER_STATUS=$(curl -s -o /dev/null -w "%{http_code}" http://localhost:7860/proxy/3939/viewer)\n\
+echo "Viewer status: $VIEWER_STATUS"\n\
+\n\
+nginx -s stop\n\
+kill $SERVER_PID $VIEWER_PID\n\
+\n\
+if [ "$MAIN_STATUS" = "200" ] && [ "$VIEWER_STATUS" = "200" ]; then\n\
+    echo "All tests passed!"\n\
+    exit 0\n\
+else\n\
+    echo "Tests failed!"\n\
+    exit 1\n\
+fi' > /code/test_build.sh && chmod +x /code/test_build.sh
+
+# Run the build-time test
+RUN /code/test_build.sh
+
 # Create a non-root user and set up home directory
 RUN useradd -m -d /home/appuser -s /bin/bash appuser && \
     touch /home/appuser/.ocpvscode && \