Added Gemfile

Dockerfile

 FROM ruby:2.5-alpine
 
-# ENV http_proxy http://proxy.admu.edu.ph:3128
-# ENV https_proxy http://proxy.admu.edu.ph:3128
+ENV http_proxy http://proxy.admu.edu.ph:3128
+ENV https_proxy http://proxy.admu.edu.ph:3128
 
 RUN apk update && apk add build-base nodejs
 

Gemfile

 source 'https://rubygems.org'
 git_source(:github) { |repo| "https://github.com/#{repo}.git" }
 
-ruby '2.5.1'
+# ruby '2.5.1'
 
 # Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
 gem 'rails', '~> 5.2.0'