Check if this is available during build

Dockerfile

@@ -5,7 +5,7 @@ RUN apt-get update -qq && apt-get install -y build-essential nodejs npm
 RUN mkdir /myapp
 WORKDIR /myapp
 
-ENV BUNDLE_GEM__FURY__IO=7LFoF-x9YJoqOoGxi84i6BCDfxDvRt0
+# ENV BUNDLE_GEM__FURY__IO=7LFoF-x9YJoqOoGxi84i6BCDfxDvRt0
 ENV APP_NAME=CMS
 ENV RAILS_ENV=production
 ENV RAILS_GROUPS=assets