make docker images smaller by 150%

Dockerfile

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

docker-entrypoint.sh

@@ -1,12 +1,4 @@
 #!/bin/bash
 
-# Exit build script on first failure.
-set -e
-
-# Exit on unset variable.
-set -u
-
-set -x
-
 node db.js
 npm start