Cleanup container and reorder

Dockerfile

@@ -1,11 +1,5 @@
 FROM node:8.10.0-alpine
 
-RUN mkdir -p /public
-
-ENV NODE_ENV production
-
-RUN apk add --no-cache git
-
 COPY ./src /app/src
 COPY ./package.json /app/package.json
 COPY ./package-lock.json /app/package-lock.json
@@ -13,11 +7,18 @@ COPY ./tsconfig.json /app/tsconfig.json
 
 WORKDIR /app
 
-RUN npm install --only=prod
-RUN npm install --only=dev
+RUN mkdir -p /public
+
+RUN apk add --no-cache git
+
+RUN npm install
+
+ENV NODE_ENV production
 
 RUN npm run build
 
+RUN npm prune --production
+
 CMD npm start -- /public
 
 EXPOSE 5000