Add Dockerfile

Dockerfile

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+FROM node:22-slim
+
+# Create app directory
+WORKDIR /home/node/openclaw
+
+# Install OpenClaw globally
+RUN npm install -g openclaw@latest
+
+# Set environment variable
+ENV OPENCLAW_NODE_MODE=true
+
+# Expose default Gateway port
+EXPOSE 18789
+
+# Set working directory for OpenClaw
+WORKDIR /home/node/openclaw
+
+# Command to start the Gateway
+CMD ["openclaw", "gateway", "--port", "18789"]