Embedding envs

gistfile1.txt

void@tahr:~/docker/etest$ cat Dockerfile 
FROM ubuntu

RUN useradd -m user
RUN echo 'export TOKEN=ok' >> /home/user/.bashrc

USER user
void@tahr:~/docker/etest$ docker build -t local/test .
Sending build context to Docker daemon 2.048 kB
Sending build context to Docker daemon 
Step 0 : FROM ubuntu
 ---> 6d4946999d4f
Step 1 : RUN useradd -m user
 ---> Running in 55ccbdacf781
 ---> 8842ca9ce9de
Removing intermediate container 55ccbdacf781
Step 2 : RUN echo 'export TOKEN=ok' >> /home/user/.bashrc
 ---> Running in 5b227b3070cb
 ---> cbfd43878a32
Removing intermediate container 5b227b3070cb
Step 3 : USER user
 ---> Running in 77631a64f4ae
 ---> 2c0b3c30d9c6
Removing intermediate container 77631a64f4ae
Successfully built 2c0b3c30d9c6
void@tahr:~/docker/etest$ docker run -it --rm -u user local/test bash -ic 'echo  $TOKEN'
ok