Set RAILS_ENV for base image.

Set RAILS_ENV for base image.

We can’t boot the Rails app if it tries to require development dependencies.

diff --git a/image/base/Dockerfile b/image/base/Dockerfile
index 9cb6924..af1b313 100644
--- a/image/base/Dockerfile
+++ b/image/base/Dockerfile
@@ -4,6 +4,7 @@ FROM ubuntu:16.04
 
 ENV PG_MAJOR 10
 ENV RUBY_ALLOCATOR /usr/lib/libjemalloc.so.1
+ENV RAILS_ENV production
 
 #LABEL maintainer="Sam Saffron \"https://twitter.com/samsaffron\""

GitHub sha: c2c7a3d8

Is the test and dev image setting defaults as well?

Set the right RAILS_ENV for other base images.