Introduce new option to bypass validation of registry configuration

lib/kamal/configuration.rb

@@ -54,7 +54,7 @@ def initialize(raw_config, destination: nil, version: nil, validate: true)
 
     # Eager load config to validate it, these are first as they have dependencies later on
     @servers = Servers.new(config: self)
-    @registry = Registry.new(config: @raw_config, secrets: secrets)
+    @registry = Registry.new(config: @raw_config, secrets: secrets, skip_validation: skip_registry_validation?)
 
     @accessories = @raw_config.accessories&.keys&.collect { |name| Accessory.new(name, config: self) } || []
     @aliases = @raw_config.aliases&.keys&.to_h { |name| [ name, Alias.new(name, config: self) ] } || {}
@@ -378,4 +378,8 @@ def git_version
           raise "Can't use commit hash as version, no git repository found in #{Dir.pwd}"
         end
     end
+
+    def skip_registry_validation?
+      true if raw_config.registry&.dig("skip_validation") == true
+    end
 end

lib/kamal/configuration/registry.rb

@@ -1,10 +1,10 @@
 class Kamal::Configuration::Registry
   include Kamal::Configuration::Validation
 
-  def initialize(config:, secrets:, context: "registry")
+  def initialize(config:, secrets:, context: "registry", skip_validation: false)
     @registry_config = config["registry"] || {}
     @secrets = secrets
-    validate! registry_config, context: context, with: Kamal::Configuration::Validator::Registry
+    validate! registry_config, context: context, with: Kamal::Configuration::Validator::Registry unless skip_validation
   end
 
   def server

test/configuration_test.rb

@@ -43,6 +43,24 @@ class ConfigurationTest < ActiveSupport::TestCase
     end
   end
 
+  test "invalid registry config still passes validation when skip_validation is true" do
+    assert_nothing_raised do
+      deploy_skip_validation = @deploy.dup.merge(
+        registry: { "skip_validation" => true }
+      )
+      Kamal::Configuration.new(deploy_skip_validation)
+    end
+  end
+
+  test "invalid registry config still passes validation when skip_validation is false" do
+  assert_raises(Kamal::ConfigurationError) do
+    deploy_fail_validation = @deploy.dup.merge(
+      registry: { "skip_validation" => false }
+    )
+    Kamal::Configuration.new(deploy_fail_validation)
+  end
+end
+
   test "image uses service name if registry is local" do
     assert_equal "app", Kamal::Configuration.new(@deploy.tap {
       _1[:registry] = { "server" => "localhost:5000" }