Skip existing containers on accessory boot

When booting an accessory, check for the container first and skip boot
if it exists. This allows us to rerun `kamal setup` on hosts with
accessories without raising an error.

Fixes: https://github.com/basecamp/kamal/issues/488

test/integration/integration_test.rb

@@ -11,7 +11,7 @@ class IntegrationTest < ActiveSupport::TestCase
   end
 
   teardown do
-    if !passed? && ENV["DEBUG"]
+    if !passed? && ENV["DEBUG_CONTAINER_LOGS"]
       [ :deployer, :vm1, :vm2, :shared, :load_balancer, :registry ].each do |container|
         puts
         puts "Logs for #{container}:"