make docker images smaller by 150%

Dockerfile

@@ -1,10 +1,22 @@
-FROM node:16
-
-# Install dependencies
-COPY package*.json ./
-RUN npm install
-
-# Package app source
-COPY . .
-
-ENTRYPOINT ["./docker-entrypoint.sh"]
+FROM node:16-alpine AS BUILD_IMAGE
+
+RUN apk add curl bash
+
+# Install dependencies
+COPY package*.json ./
+RUN npm install
+
+RUN npm prune --production
+
+RUN curl -sf https://gobinaries.com/tj/node-prune | sh
+
+FROM node:16-alpine
+
+COPY --from=BUILD_IMAGE /node_modules ./node_modules
+COPY . .
+
+ENV NODE_ENV=production
+
+RUN node db.js
+
+CMD ["npm", "start"]