Add Dashboard service Dockerfile

services/dashboard/Dockerfile

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+FROM node:18-alpine
+
+# Install system dependencies
+RUN apk add --no-cache \
+    python3 \
+    make \
+    g++
+
+WORKDIR /app
+
+# Copy package files
+COPY package*.json ./
+
+# Install dependencies
+RUN npm ci --only=production
+
+# Copy source code
+COPY src/ ./src/
+
+# Create necessary directories
+RUN mkdir -p /app/logs /app/public/css /app/public/js /app/public/assets
+
+# Run as non-root user
+RUN addgroup -g 1001 -S nodejs
+RUN adduser -S dashboard -u 1001
+RUN chown -R dashboard:nodejs /app
+USER dashboard
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
+    CMD node src/healthcheck.js || exit 1
+
+# Expose port
+EXPOSE 3000
+
+# Start the service
+CMD ["node", "src/app.js"]