Add command to list containers (to ease rollback)

lib/mrsk/commands/app.rb

@@ -36,6 +36,10 @@ class Mrsk::Commands::App < Mrsk::Commands::Base
     [ "docker ps -q #{service_filter.join(" ")} | xargs docker logs -f" ]
   end
 
+  def list_containers
+    docker :container, :ls, "-a", *service_filter
+  end
+
   def remove_containers
     docker :container, :prune, "-f", *service_filter
   end

lib/tasks/mrsk/app.rake

@@ -51,6 +51,11 @@ namespace :mrsk do
       on(MRSK_CONFIG.servers) { |host| puts "App Host: #{host}\n" + capture(*app.info) + "\n\n" }
     end
 
+    desc "List all the app containers currently on servers"
+    task :containers do
+      on(MRSK_CONFIG.servers) { |host| puts "App Host: #{host}\n" + capture(*app.list_containers) + "\n\n" }
+    end
+
     desc "Tail logs from app containers"
     task :logs do
       on(MRSK_CONFIG.servers) { execute *app.logs }