[DDW-169] Only bake in NODE_ENV value for production build
[DDW-169] Only bake in NODE_ENV value for production build

When running tests based on the webpack build, it needs NODE_ENV to
not be set so that the correct path to ca.crt is chosen.

input-output-hk/daedalus,input-output-hk/daedalus,input-output-hk/daedalus,input-output-hk/daedalus,input-output-hk/daedalus,input-output-hk/daedalus