Adding push rules to exported project

This commit adds push rules to an exported project.
As such, project imports will now include the push rules.

This is done for a customer who reached out to GitLab Support.
See https://gitlab.com/gitlab-org/gitlab/-/issues/270970

ee/changelogs/unreleased/add-push-rules-to-project-export.yml

+---
+title: Adding push rules to project exports
+merge_request: 46275
+author:
+type: added

ee/spec/fixtures/lib/gitlab/import_export/complex/project.json

@@ -33,5 +33,22 @@
     "auto_fix_sast": false,
     "auto_fix_coverage_fuzzing": false,
     "auto_fix_api_fuzzing": false
+  },
+  "push_rule": {
+    "force_push_regex": "MustContain",
+    "delete_branch_regex": "MustContain",
+    "commit_message_regex": "MustContain",
+    "author_email_regex": "MustContain",
+    "file_name_regex": "MustContain",
+    "branch_name_regex": "MustContain",
+    "commit_message_negative_regex": "MustNotContain",
+    "max_file_size": 1,
+    "deny_delete_tag": true,
+    "member_check": true,
+    "is_sample": true,
+    "prevent_secrets": true,
+    "reject_unsigned_commits": true,
+    "commit_committer_check": true,
+    "regexp_uses_re2": true
   }
 }

ee/spec/fixtures/lib/gitlab/import_export/complex/tree/project/push_rule.ndjson

+{"force_push_regex":"MustContain","delete_branch_regex":"MustContain","commit_message_regex":"MustContain","author_email_regex":"MustContain","file_name_regex":"MustContain","branch_name_regex":"MustContain","commit_message_negative_regex":"MustNotContain","max_file_size":1,"deny_delete_tag":true,"member_check":true,"is_sample":true,"prevent_secrets":true,"reject_unsigned_commits":true,"commit_committer_check":true,"regexp_uses_re2":true}

ee/spec/lib/ee/gitlab/import_export/project/tree_restorer_spec.rb

@@ -112,4 +112,24 @@ RSpec.describe Gitlab::ImportExport::Project::TreeRestorer do
       expect(project.security_setting.auto_fix_container_scanning).to be_truthy
     end
   end
+
+  describe 'push_rules' do
+    let_it_be(:project) { create(:project, name: 'project', path: 'project') }
+    let(:user) { create(:user)}
+
+    before do
+      setup_import_export_config('complex', 'ee')
+    end
+
+    it 'creates push rules' do
+      project = Project.find_by_path('project')
+
+      expect { restored_project_json }.to change { PushRule.count }.from(0).to(1)
+
+      expect(project.push_rule.force_push_regex).to eq("MustContain")
+      expect(project.push_rule.commit_message_negative_regex).to eq("MustNotContain")
+      expect(project.push_rule.max_file_size).to eq(1)
+      expect(project.push_rule.deny_delete_tag).to be_truthy
+    end
+  end
 end

ee/spec/lib/ee/gitlab/import_export/project/tree_saver_spec.rb

@@ -16,6 +16,7 @@ RSpec.describe Gitlab::ImportExport::Project::TreeSaver do
   let_it_be(:export_path) { "#{Dir.tmpdir}/project_tree_saver_spec_ee" }
 
   let_it_be(:security_setting) { create(:project_security_setting, project: project, auto_fix_dast: false) }
+  let_it_be(:push_rule) { create(:push_rule, project: project, max_file_size: 10) }
 
   after :all do
     FileUtils.rm_rf(export_path)
@@ -78,6 +79,18 @@ RSpec.describe Gitlab::ImportExport::Project::TreeSaver do
         expect(security_json['auto_fix_dependency_scanning']).to be_truthy
       end
     end
+
+    context 'push_rule' do
+      let(:push_rule_json) do
+        json = get_json(full_path, exportable_path, :push_rule, ndjson_enabled)
+        ndjson_enabled ? json.first : json
+      end
+
+      it 'has push rules' do
+        expect(push_rule_json['max_file_size']).to eq(10)
+        expect(push_rule_json['force_push_regex']).to eq('feature\/.*')
+      end
+    end
   end
 
   context 'with JSON' do

lib/gitlab/import_export/project/import_export.yml

@@ -411,8 +411,25 @@ ee:
         - :deploy_access_levels
       - :service_desk_setting
       - :security_setting
+      - :push_rule
 
   included_attributes:
     issuable_sla:
       - :issue
       - :due_at
+    push_rule:
+      - :force_push_regex
+      - :delete_branch_regex
+      - :commit_message_regex
+      - :author_email_regex
+      - :file_name_regex
+      - :branch_name_regex
+      - :commit_message_negative_regex
+      - :max_file_size
+      - :deny_delete_tag
+      - :member_check
+      - :is_sample
+      - :prevent_secrets
+      - :reject_unsigned_commits
+      - :commit_committer_check
+      - :regexp_uses_re2

spec/fixtures/lib/gitlab/import_export/complex/project.json

@@ -7211,5 +7211,23 @@
         }
       ]
     }
-  ]
+  ],
+  "push_rule": {
+    "force_push_regex": "MustContain",
+    "delete_branch_regex": "MustContain",
+    "commit_message_regex": "MustContain",
+    "author_email_regex": "MustContain",
+    "file_name_regex": "MustContain",
+    "branch_name_regex": "MustContain",
+    "commit_message_negative_regex": "MustNotContain",
+    "max_file_size": 1,
+    "deny_delete_tag": true,
+    "member_check": true,
+    "is_sample": true,
+    "prevent_secrets": true,
+    "reject_unsigned_commits": true,
+    "commit_committer_check": true,
+    "regexp_uses_re2": true
+  }
+
 }

spec/lib/gitlab/import_export/safe_model_attributes.yml

@@ -858,3 +858,19 @@ ProjectSecuritySetting:
 IssuableSla:
   - issue_id
   - due_at
+PushRule:
+  - force_push_regex
+  - delete_branch_regex
+  - commit_message_regex
+  - author_email_regex
+  - file_name_regex
+  - branch_name_regex
+  - commit_message_negative_regex
+  - max_file_size
+  - deny_delete_tag
+  - member_check
+  - is_sample
+  - prevent_secrets
+  - reject_unsigned_commits
+  - commit_committer_check
+  - regexp_uses_re2