Add MEDIAWIKI_PROXY_SERVERS setting

LocalSettings.php.tmpl

@@ -120,6 +120,13 @@ $wgGroupPermissions['*']['read'] = false;
 $wgGroupPermissions['*']['read'] = true;
 {{ end }}
 
+{{ if ne (env "MEDIAWIKI_PROXY_SERVERS") "" }}
+// In LocalSettings.php
+$wgUseCdn = true;
+$wgCdnServersNoPurge = [];
+$wgCdnServersNoPurge[] = "{{ env "MEDIAWIKI_PROXY_SERVERS" }}";
+{{ end }}
+
 # Enabled skins.
 # The following skins were automatically enabled:
 wfLoadSkin( 'MonoBook' );