added Capistrano configuration

config/deploy.rb

@@ -0,0 +1,25 @@
+# config valid only for Capistrano 3.1
+lock '3.2.1'
+
+set :application, 'code_ocean'
+set :config_example_suffix, '.example'
+set :deploy_to, '/var/www/app'
+set :keep_releases, 3
+set :linked_dirs, %w[bin log public/uploads tmp/cache tmp/files tmp/pids tmp/sockets]
+set :linked_files, %w[config/action_mailer.yml config/database.yml config/secrets.yml config/sendmail.yml config/smtp.yml]
+set :log_level, :info
+set :puma_threads, [0, 16]
+set :repo_url, 'git@github.com:openHPI/codeocean.git'
+
+namespace :deploy do
+  before 'check:linked_files', 'config:push'
+
+  after :compile_assets, :copy_vendor_assets do
+    on roles(fetch(:assets_roles)) do
+      within release_path do
+        execute :cp, 'vendor/assets/images/*', 'public/assets/'
+        execute :cp, '-r', 'vendor/assets/javascripts/ace', 'public/assets/'
+      end
+    end
+  end
+end

config/deploy/production.rb

@@ -0,0 +1 @@
+server 'CHANGE_ME', roles: [:app, :db, :puma_nginx, :web], user: 'CHANGE_ME'