Merge branch 'v2.2.1-alpha' into master

Dockerfile

@@ -1,7 +1,14 @@
 FROM ruby:2.5
 
 # Install app dependencies.
-RUN apt-get update -qq && apt-get install -y build-essential libpq-dev nodejs
+RUN apt-get update -qq && apt-get install -y build-essential libpq-dev curl
+
+ADD https://dl.yarnpkg.com/debian/pubkey.gpg /tmp/yarn-pubkey.gpg
+
+RUN apt-key add /tmp/yarn-pubkey.gpg && rm /tmp/yarn-pubkey.gpg && \
+echo 'deb http://dl.yarnpkg.com/debian/ stable main' > /etc/apt/sources.list.d/yarn.list &&  \
+curl -sL https://deb.nodesource.com/setup_10.x | bash - && \
+apt-get update && apt-get install -y nodejs yarn
 
 # Set an environment variable for the install location.
 ENV RAILS_ROOT /usr/src/app
@@ -23,9 +30,9 @@ RUN bundle install --without development test --deployment --clean
 # Adding project files.
 COPY . .
 
-# Precompile assets.
-RUN bundle exec rake assets:clean
-RUN bundle exec rake assets:precompile
+# Precompile assets
+RUN SECRET_KEY_BASE="$(bundle exec rake secret)" bundle exec rake assets:clean
+RUN SECRET_KEY_BASE="$(bundle exec rake secret)" bundle exec rake assets:precompile
 
 # Expose port 80.
 EXPOSE 80

Gemfile

@@ -8,13 +8,13 @@ git_source(:github) do |repo_name|
 end
 
 # Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
-gem 'rails', '~> 5.0.7'
+gem 'rails', '~> 5.2.3'
 
 # Use Puma as the app server
 gem 'puma', '~> 3.0'
 
 # Use SCSS for stylesheets
-gem 'sass-rails', '~> 5.0'
+gem 'sassc-rails'
 
 # Use Uglifier as compressor for JavaScript assets
 gem 'uglifier', '>= 1.3.0'
@@ -35,11 +35,14 @@ gem 'turbolinks', '~> 5'
 gem 'jbuilder', '~> 2.5'
 
 # Use Redis adapter to run Action Cable in production
-gem 'redis', '~> 3.0'
+# gem 'redis', '~> 3.0'
 
 # Use ActiveModel has_secure_password
 gem 'bcrypt', '~> 3.1.7'
 
+# Reduces boot times through caching; required in config/boot.rb
+gem 'bootsnap', '>= 1.1.0', require: false
+
 # Authentication.
 gem 'omniauth'
 gem 'omniauth-twitter'
@@ -54,7 +57,7 @@ gem 'bigbluebutton-api-ruby'
 
 # Front-end.
 gem 'bootstrap', '~> 4.3.1'
-gem 'tabler-rubygem'
+gem 'tabler-rubygem', git: 'https://github.com/vbalazs/tabler-rubygem.git', branch: 'fix-sass'
 gem 'pagy'
 
 # For detecting the users preferred language.