Add serveral minor improvements to container registry

app/controllers/projects/registry/repositories_controller.rb

@@ -9,7 +9,8 @@ module Projects
       def destroy
         if image.destroy
-          redirect_to project_container_registry_path(@project)
+          redirect_to project_container_registry_path(@project),
+                      notice: 'Images repository has been removed successfully!'
         else
           redirect_to project_container_registry_path(@project),
                       alert: 'Failed to remove images repository!'

app/controllers/projects/registry/tags_controller.rb

@@ -5,7 +5,8 @@ module Projects
       def destroy
         if tag.delete
-          redirect_to project_container_registry_path(@project)
+          redirect_to project_container_registry_path(@project),
+                      notice: 'Tag removed successfull!'
         else
           redirect_to project_container_registry_path(@project),
                       alert: 'Failed to remove repository tag!'

app/models/container_repository.rb

@@ -4,7 +4,8 @@ class ContainerRepository < ActiveRecord::Base
   validates :name, length: { minimum: 0, allow_nil: false }
   delegate :client, to: :registry
-  before_destroy :delete_tags
+
+  before_destroy :delete_tags!
   def registry
     @registry ||= begin

app/views/projects/registry/repositories/_image.html.haml

@@ -10,7 +10,11 @@
       = escape_once(image.path)
     = clipboard_button(clipboard_text: "docker pull #{image.path}")
     .controls.hidden-xs.pull-right
-      = link_to namespace_project_container_registry_path(@project.namespace, @project, image.id), class: 'btn btn-remove has-tooltip', title: "Remove image", data: { confirm: "Are you sure?" }, method: :delete do
+      = link_to namespace_project_container_registry_path(@project.namespace, @project, image),
+                class: 'btn btn-remove has-tooltip',
+                title: 'Remove repository',
+                data: { confirm: 'Are you sure?' },
+                method: :delete do
         = icon("trash cred")

lib/container_registry/tag.rb

@@ -36,9 +36,7 @@ module ContainerRegistry
     end
     def digest
-      return @digest if defined?(@digest)
-
-      @digest = client.repository_tag_digest(repository.path, name)
+      @digest ||= client.repository_tag_digest(repository.path, name)
     end
     def config_blob