Set up Redis so it works in dev environment. [#3]

Gemfile

@@ -26,6 +26,7 @@ gem 'bootsnap', '>= 1.4.2', require: false
 gem "haml-rails", "~> 2.0"
 gem 'faraday', '~> 1.0.1'
 gem 'moneta'
+gem 'redis'
 
 group :development, :test do
   # Call 'byebug' anywhere in the code to stop execution and get a debugger console

Gemfile.lock

@@ -226,6 +226,7 @@ GEM
     rb-fsevent (0.10.3)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
+    redis (4.1.3)
     regexp_parser (1.7.0)
     rspec (3.9.0)
       rspec-core (~> 3.9.0)
@@ -322,6 +323,7 @@ DEPENDENCIES
   moneta
   puma (~> 4.1)
   rails (~> 6.0.2, >= 6.0.2.2)
+  redis
   rspec-rails (~> 4.0.0)
   sass-rails (>= 6)
   spring

docker-compose.yml

@@ -6,6 +6,7 @@ services:
   web:
     environment:
       PORT: 3000
+      REDIS_URL: "redis://cache:6379"
     build: .
     command: bundle exec rails s
     volumes:
@@ -16,5 +17,7 @@ services:
     command: ["bundle", "exec", "rails", "server", "-b", "0.0.0.0"]
   cache:
     image: redis:5.0.8-alpine
+    expose: ["6379"]
+    networks: [internal]
 volumes:
   bundle: # see https://dev.to/k_penguin_sato/cache-rails-gems-using-docker-compose-3o3f