Protect manual actions against protected tag too

app/policies/ci/build_policy.rb

@@ -3,9 +3,10 @@ module Ci
     condition(:protected_action) do
       next false unless @subject.action?
 
-      !::Gitlab::UserAccess
-        .new(@user, project: @subject.project)
-        .can_merge_to_branch?(@subject.ref)
+      access = ::Gitlab::UserAccess.new(@user, project: @subject.project)
+
+      !access.can_merge_to_branch?(@subject.ref) ||
+        !access.can_create_tag?(@subject.ref)
     end
 
     rule { protected_action }.prevent :update_build

spec/policies/ci/build_policy_spec.rb

@@ -103,12 +103,7 @@ describe Ci::BuildPolicy, :models do
         project.add_developer(user)
       end
 
-      context 'when branch build is assigned to is protected' do
-        before do
-          create(:protected_branch, :no_one_can_push,
-                 name: 'some-ref', project: project)
-        end
-
+      shared_examples 'protected ref' do
         context 'when build is a manual action' do
           let(:build) do
             create(:ci_build, :manual, ref: 'some-ref', pipeline: pipeline)
@@ -130,6 +125,24 @@ describe Ci::BuildPolicy, :models do
         end
       end
 
+      context 'when build is against a protected branch' do
+        before do
+          create(:protected_branch, :no_one_can_push,
+                 name: 'some-ref', project: project)
+        end
+
+        it_behaves_like 'protected ref'
+      end
+
+      context 'when build is against a protected tag' do
+        before do
+          create(:protected_tag, :no_one_can_create,
+                 name: 'some-ref', project: project)
+        end
+
+        it_behaves_like 'protected ref'
+      end
+
       context 'when branch build is assigned to is not protected' do
         context 'when build is a manual action' do
           let(:build) { create(:ci_build, :manual, pipeline: pipeline) }