Change baseimage from node to node-alpine

Size drastically decreased

Dockerfile

@@ -1,4 +1,4 @@
-FROM node:16
+FROM node:16-alpine
 
 # Create app directory
 WORKDIR /usr/src/app
@@ -7,9 +7,8 @@ WORKDIR /usr/src/app
 COPY package*.json ./
 RUN npm install
 
-RUN apt-get update
-RUN apt-get -y install \
-    tcpdump
+RUN apk update
+RUN apk add tcpdump
 
 # Bundle app source
 COPY ./src/ .