feat: add Docker build

.dockerignore

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+.git
+.gitignore
+.cursor
+*.md
+node_modules
+README.md
+docs
+

Dockerfile

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+# Build stage
+FROM node:20-alpine AS builder
+
+WORKDIR /app
+
+# Copy package files
+COPY package*.json ./
+
+# Install dependencies
+RUN npm ci --only=production
+
+# Runtime stage
+FROM node:20-alpine
+
+# Install wget for health checks
+RUN apk --no-cache add wget
+
+WORKDIR /app
+
+# Copy dependencies from builder
+COPY --from=builder /app/node_modules ./node_modules
+
+# Copy application files
+COPY package*.json ./
+COPY server ./server
+COPY presets ./presets
+COPY public ./public
+
+# Create non-root user (let Alpine assign available GID/UID)
+RUN addgroup spore && \
+    adduser -D -s /bin/sh -G spore spore && \
+    chown -R spore:spore /app
+
+USER spore
+
+# Expose port
+EXPOSE 8080
+
+# Run the application
+CMD ["node", "server/index.js"]
+

Makefile

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+.PHONY: install build run clean docker-build docker-run docker-push
+
+# Install dependencies
+install:
+	npm install
+
+# Build the application (if needed)
+build: install
+
+# Run the application
+run:
+	node server/index.js
+
+# Start in development mode
+dev:
+	node server/index.js
+
+# Clean build artifacts
+clean:
+	rm -rf node_modules
+	rm -f package-lock.json
+
+# Docker variables
+DOCKER_REGISTRY ?= 
+IMAGE_NAME = wirelos/spore-ledlab
+IMAGE_TAG ?= latest
+FULL_IMAGE_NAME = $(if $(DOCKER_REGISTRY),$(DOCKER_REGISTRY)/$(IMAGE_NAME),$(IMAGE_NAME)):$(IMAGE_TAG)
+
+# Build Docker image
+docker-build:
+	docker build -t $(FULL_IMAGE_NAME) .
+
+# Run Docker container
+docker-run:
+	docker run -p 8080:8080 --rm $(FULL_IMAGE_NAME)
+
+# Push Docker image
+docker-push:
+	docker push $(FULL_IMAGE_NAME)
+