Ensure primary_role app hosts are sorted first

When booting non-primary role hosts we will always wait for a primary
role host to boor first.

So when booting in groups, if there are no primary role hosts in the
first batch, then booting will stall.

Sort primary role app_hosts first to avoid this.

Fixes: https://github.com/basecamp/kamal/issues/1553

test/commander_test.rb

@@ -149,6 +149,12 @@ class CommanderTest < ActiveSupport::TestCase
     assert_equal [], @kamal.accessory_hosts
   end
 
+  test "primary role hosts are first" do
+    configure_with(:deploy_with_roles_workers_primary)
+    assert_equal [ "1.1.1.1", "1.1.1.2", "1.1.1.3", "1.1.1.4" ], @kamal.hosts
+    assert_equal [ "1.1.1.1", "1.1.1.2", "1.1.1.3", "1.1.1.4" ], @kamal.app_hosts
+  end
+
   private
     def configure_with(variant)
       @kamal = Kamal::Commander.new.tap do |kamal|

test/fixtures/deploy_with_roles_workers_primary.yml

@@ -0,0 +1,19 @@
+service: app
+image: dhh/app
+servers:
+  workers:
+    - 1.1.1.1
+    - 1.1.1.2
+  web:
+    - 1.1.1.3
+    - 1.1.1.4
+env:
+  REDIS_URL: redis://x/y
+registry:
+  server: registry.digitalocean.com
+  username: user
+  password: pw
+builder:
+  arch: amd64
+deploy_timeout: 1
+primary_role: workers