Increase width of dropdown menus automatically up to 500 px

app/assets/stylesheets/framework/dropdowns.scss

@@ -186,11 +186,12 @@
 .dropdown-menu-nav {
   display: block;
   position: absolute;
-  width: 100%;
+  width: auto;
   top: 100%;
   left: 0;
   z-index: 9;
   min-width: 240px;
+  max-width: 500px;
   margin-top: 2px;
   margin-bottom: 0;
   font-size: 14px;

changelogs/unreleased/artifacts-download-dropdown-menu-is-too-narrow.yml

+---
+title: Increase width of dropdown menus automatically
+merge_request: 12809
+author: Thomas Wucher