🐳 Added Dockerfile

Dockerfile

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+FROM node:12-alpine
+LABEL maintainer="Rishi Ghan <rishi.ghan@gmail.com>"
+
+# Working directory
+WORKDIR /metadata-service
+# Install dependencies
+COPY package.json package-lock.json ./
+RUN npm ci --silent
+
+# Copy source
+COPY . .
+
+# Build and cleanup
+ENV NODE_ENV=production
+RUN npm run build \
+ && npm prune
+
+EXPOSE 3080
+# Start server
+CMD ["npm", "start"]