Add Dockerfile

Dockerfile

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+# Stage 1: Build the frontend
+FROM node:20 AS frontend-builder
+WORKDIR /app
+COPY frontend/package*.json ./
+RUN npm ci
+COPY frontend .
+RUN npm run build
+
+# Stage 2: Build the backend
+FROM golang:1.23 AS backend-builder
+WORKDIR /app
+RUN apt-get update && apt-get install -y gcc musl-dev
+COPY backend/go.mod backend/go.sum ./
+RUN go mod download
+COPY backend .
+RUN CGO_ENABLED=1 GOOS=linux go build -o novamd ./cmd/server
+
+# Stage 3: Final stage
+FROM debian:bookworm-slim
+WORKDIR /app
+COPY --from=backend-builder /app/novamd .
+COPY --from=frontend-builder /app/dist ./dist
+
+RUN mkdir -p /app/data
+
+# Set default environment variables
+ENV NOVAMD_STATIC_PATH=/app/dist
+ENV NOVAMD_PORT=8080
+ENV NOVAMD_WORKDIR=/app/data
+
+EXPOSE 8080
+
+CMD ["./novamd"]