Set ENV for NODE_ENV

This ensures that the value of NODE_ENV is made available to the CMD
context. This ensures commands such as `npm start` or `node index.js`
are using the correct NODE_ENV.

See comments in
docker-library/official-images#2156

Author: Christopher Horrell

0.10/onbuild/Dockerfile

@@ -4,6 +4,7 @@ RUN mkdir -p /usr/src/app
 WORKDIR /usr/src/app
 
 ONBUILD ARG NODE_ENV
+ONBUILD ENV NODE_ENV $NODE_ENV
 ONBUILD COPY package.json /usr/src/app/
 ONBUILD RUN npm install
 ONBUILD COPY . /usr/src/app

0.12/onbuild/Dockerfile

@@ -4,6 +4,7 @@ RUN mkdir -p /usr/src/app
 WORKDIR /usr/src/app
 
 ONBUILD ARG NODE_ENV
+ONBUILD ENV NODE_ENV $NODE_ENV
 ONBUILD COPY package.json /usr/src/app/
 ONBUILD RUN npm install
 ONBUILD COPY . /usr/src/app

4.5/onbuild/Dockerfile

@@ -4,6 +4,7 @@ RUN mkdir -p /usr/src/app
 WORKDIR /usr/src/app
 
 ONBUILD ARG NODE_ENV
+ONBUILD ENV NODE_ENV $NODE_ENV
 ONBUILD COPY package.json /usr/src/app/
 ONBUILD RUN npm install
 ONBUILD COPY . /usr/src/app

6.6/onbuild/Dockerfile

@@ -4,6 +4,7 @@ RUN mkdir -p /usr/src/app
 WORKDIR /usr/src/app
 
 ONBUILD ARG NODE_ENV
+ONBUILD ENV NODE_ENV $NODE_ENV
 ONBUILD COPY package.json /usr/src/app/
 ONBUILD RUN npm install
 ONBUILD COPY . /usr/src/app

Dockerfile-onbuild.template

@@ -4,6 +4,7 @@ RUN mkdir -p /usr/src/app
 WORKDIR /usr/src/app
 
 ONBUILD ARG NODE_ENV
+ONBUILD ENV NODE_ENV $NODE_ENV
 ONBUILD COPY package.json /usr/src/app/
 ONBUILD RUN npm install
 ONBUILD COPY . /usr/src/app