[DREAM-782] Implement mechanism to prevent that protected components are modified

.github/dangerfiles/op_primer_changes/Dangerfile

@@ -0,0 +1,55 @@
+# frozen_string_literal: true
+
+#-- copyright
+# OpenProject is an open source project management software.
+# Copyright (C) the OpenProject GmbH
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License version 3.
+#
+# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
+# Copyright (C) 2006-2013 Jean-Philippe Lang
+# Copyright (C) 2010-2013 the ChiliProject Team
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+#
+# See COPYRIGHT and LICENSE files for more details.
+#++
+
+OP_PRIMER_REGEX = %r{app/components/op_primer/}
+
+def modified_op_primer_files
+  (git.modified_files + git.added_files).grep(OP_PRIMER_REGEX)
+end
+
+changed_files = modified_op_primer_files
+
+if changed_files.any?
+  message_lines = [
+    "@opf/dream-team Files in `app/components/op_primer` were modified:",
+    ""
+  ]
+
+  changed_files.each do |file|
+    message_lines << "- #{file}"
+  end
+
+  message_lines << <<~EOS
+
+    Please review these changes to ensure they align with the design system guidelines.
+  EOS
+
+  warn message_lines.join("\n")
+end

Dangerfile

@@ -30,3 +30,4 @@
 danger.import_dangerfile(path: ".github/dangerfiles/user_references/Dangerfile")
 danger.import_dangerfile(path: ".github/dangerfiles/release_migrations/Dangerfile")
 danger.import_dangerfile(path: ".github/dangerfiles/project_id_contract/Dangerfile")
+danger.import_dangerfile(path: ".github/dangerfiles/op_primer_changes/Dangerfile")