[webui][ci] Check multiple package_groups

Is not allowed to have multiple `package_groups` with the same attributes.

src/api/app/models/kiwi/image.rb

@@ -31,6 +31,8 @@ class Kiwi::Image < ApplicationRecord
   #### Validations macros
   validates :name, presence: true
   validate :check_use_project_repositories
+  validate :check_package_groups
+  validate :check_package_group_type_image
   accepts_nested_attributes_for :repositories, allow_destroy: true
   accepts_nested_attributes_for :package_groups, allow_destroy: true
   accepts_nested_attributes_for :kiwi_packages, allow_destroy: true
@@ -133,7 +135,7 @@ def outdated?
   end
 
   def default_package_group
-    package_groups.type_image
+    package_groups.type_image.first || package_groups.create(kiwi_type: :image, pattern_type: 'onlyRequired')
   end
 
   def self.find_binaries_by_name(query, project, repositories, options = {})
@@ -170,6 +172,19 @@ def check_use_project_repositories
     errors.add(:base,
                "A repository with source_path=\"obsrepositories:/\" has been set. If you want to use it, please remove the other repositories.")
   end
+
+  def check_package_group_type_image
+    return if package_groups.select(&:kiwi_type_image?).size <= 2
+
+    errors.add(:base, "Having more than 2 package groups with type='image' is not allowed.")
+  end
+
+  def check_package_groups
+    return if package_groups.group_by { |package_group| [package_group.kiwi_type, package_group.pattern_type] }
+                            .select { |_key, value| value.count > 1 }.keys.empty?
+
+    errors.add(:base, "Multiple package groups with same attributes is not allowed.")
+  end
 end
 
 # == Schema Information

src/api/app/models/kiwi/package_group.rb

@@ -26,6 +26,10 @@ def to_xml
 
     builder.to_xml save_with: Nokogiri::XML::Node::SaveOptions::NO_DECLARATION | Nokogiri::XML::Node::SaveOptions::FORMAT
   end
+
+  def kiwi_type_image?
+    kiwi_type == 'image'
+  end
 end
 
 # == Schema Information