Add package lock to builder

Dockerfile

@@ -3,6 +3,7 @@ FROM node:14.15.1 as builder
 
 # Copy the package.json file first in order to cache the modules
 COPY ./package.json /app/package.json
+COPY ./package-lock.json /app/package-lock.json
 WORKDIR /app
 # Install npm dependencies
 RUN npm install