docker build : install devDependencies so the build succeed (#1625)

Dockerfile

@@ -1,12 +1,12 @@
 FROM node:14-alpine AS build
 
-ENV NODE_ENV=production
 WORKDIR /usr/src/app
 
 COPY package.json package-lock.json ./
 RUN npm install
 
 COPY . .
+ENV NODE_ENV=production
 RUN npm run build:app
 
 FROM nginx:1.17-alpine