Bump ruby to 2.6.6 and speed up docker build

.ruby-version

@@ -1 +1 @@
-ruby-2.6.3
+ruby-2.6.6

Gemfile

@@ -1,24 +1,22 @@
 source 'https://rubygems.org'
 git_source(:github) { |repo| "https://github.com/#{repo}.git" }
 
-ruby '2.6.3'
+ruby '2.6.6'
 
-# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
 gem 'rails', '6.0.4.7'
-# Use postgresql as the database for Active Record
+
 gem 'pg', '>= 0.18', '< 2.0'
-# Use Puma as the app server
+
 gem 'puma', '~> 4.3'
-# Use SCSS for stylesheets
 gem 'sass-rails', '~> 5'
-# Transpile app-like JavaScript. Read more: https://github.com/rails/webpacker
+gem 'sassc', '2.1.0' # temporarely, because 2.4.0 takes 5 minutes to install...
+
 gem 'webpacker', '~> 4.0'
-# Turbolinks makes navigating your web application faster. Read more: https://github.com/turbolinks/turbolinks
+
 gem 'turbolinks', '~> 5'
-# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
+
 gem 'jbuilder', '~> 2.7'
 
-# Reduces boot times through caching; required in config/boot.rb
 gem 'bootsnap', '>= 1.4.2', require: false
 
 # Authentication
@@ -34,7 +32,6 @@ gem 'react-rails', '~> 2.6.0'
 gem 'kaminari', '~> 1.2.1'
 
 group :development, :test do
-  # Call 'byebug' anywhere in the code to stop execution and get a debugger console
   gem 'byebug', platforms: [:mri, :mingw, :x64_mingw]
 
   gem 'rspec-rails', '~> 3.8.2'
@@ -42,10 +39,8 @@ group :development, :test do
 end
 
 group :development do
-  # Access an interactive console on exception pages or by calling 'console' anywhere in the code.
   gem 'web-console', '>= 3.3.0'
   gem 'listen', '>= 3.0.5', '< 3.2'
-  # Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
   gem 'spring'
   gem 'spring-watcher-listen', '~> 2.0.0'
 end

Gemfile.lock

@@ -135,7 +135,7 @@ GEM
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
       ruby_dep (~> 1.2)
-    loofah (2.15.0)
+    loofah (2.16.0)
       crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
     mail (2.7.1)
@@ -144,17 +144,15 @@ GEM
     matrix (0.4.2)
     method_source (1.0.0)
     mini_mime (1.1.2)
-    mini_portile2 (2.8.0)
     minitest (5.15.0)
     momentjs-rails (2.29.1.1)
       railties (>= 3.1)
-    msgpack (1.4.5)
+    msgpack (1.5.1)
     nio4r (2.5.8)
-    nokogiri (1.13.3)
-      mini_portile2 (~> 2.8.0)
+    nokogiri (1.13.3-x86_64-linux)
       racc (~> 1.4)
     orm_adapter (0.5.0)
-    pg (1.3.4)
+    pg (1.3.5)
     public_suffix (4.0.6)
     puma (4.3.12)
       nio4r (~> 2.0)
@@ -194,7 +192,7 @@ GEM
     rb-fsevent (0.11.1)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
-    react-rails (2.6.1)
+    react-rails (2.6.2)
       babel-transpiler (>= 0.7.0)
       connection_pool
       execjs
@@ -235,7 +233,7 @@ GEM
       sprockets (>= 2.8, < 4.0)
       sprockets-rails (>= 2.0, < 4.0)
       tilt (>= 1.1, < 3)
-    sassc (2.4.0)
+    sassc (2.1.0-x86_64-linux)
       ffi (~> 1.9)
     sassc-rails (2.1.2)
       railties (>= 4.0.0)
@@ -308,6 +306,7 @@ DEPENDENCIES
   react-rails (~> 2.6.0)
   rspec-rails (~> 3.8.2)
   sass-rails (~> 5)
+  sassc (= 2.1.0)
   selenium-webdriver
   spring
   spring-watcher-listen (~> 2.0.0)
@@ -318,7 +317,7 @@ DEPENDENCIES
   webpacker (~> 4.0)
 
 RUBY VERSION
-   ruby 2.6.3p62
+   ruby 2.6.6p146
 
 BUNDLED WITH
    1.17.2

config/webpacker.yml

@@ -56,7 +56,7 @@ development:
   compile: true
 
   # Verifies that correct packages and versions are installed by inspecting package.json, yarn.lock, and node_modules
-  check_yarn_integrity: true
+  check_yarn_integrity: false
 
   # Reference: https://webpack.js.org/configuration/dev-server/
   dev_server:

docker/app/Dockerfile

@@ -1,4 +1,4 @@
-FROM ruby:2.6.3
+FROM ruby:2.6.6
 
 RUN curl -sL https://deb.nodesource.com/setup_14.x | bash -
 RUN apt-get update -qq && apt-get install -y nodejs postgresql-client
@@ -18,7 +18,7 @@ WORKDIR ${APP_ROOT}
 RUN gem install foreman
 
 # Copy Gemfile and install gems
-COPY Gemfile* ${APP_ROOT}/
+COPY Gemfile Gemfile.lock ${APP_ROOT}/
 RUN bundle install
 
 # Copy package.json and install packages