Update Dockerfile

Dockerfile

@@ -20,24 +20,24 @@ COPY . /app
 # Set permissions for non-root user
 RUN chown -R user:user /app
 
-# Create startup script that logs tmate link
-RUN cat << 'EOF' > /app/start.sh
+# Create startup script using proper heredoc
+RUN bash -c 'cat <<EOF > /app/start.sh
 #!/bin/bash
 
-# Start tmate in the background and write output to log
+# Start tmate in background and log output
 tmate -F > /tmp/tmate.log 2>&1 &
 
-# Wait for tmate to initialize
+# Wait for tmate to start
 sleep 2
 
-# Print the SSH/web link from the tmate log
+# Show SSH/Web link in logs
 grep -E "ssh|web|https" /tmp/tmate.log || tail -n 20 /tmp/tmate.log
 
-# Start FastAPI app
+# Run FastAPI
 exec uvicorn main:app --host 0.0.0.0 --port 7860
-EOF
+EOF'
 
-# Make the script executable
+# Make script executable
 RUN chmod +x /app/start.sh
 
 # Switch to non-root user