Change encoder config node from scalar to enum

Co-authored-by: HypeMC <[email protected]>

Author: 2 people

src/DependencyInjection/Configuration.php

@@ -839,7 +839,7 @@ private function addGelfSection(ArrayNodeDefinition $handlerNode)
                         ->scalarNode('hostname')->end()
                         ->scalarNode('port')->defaultValue(12201)->end()
                         ->scalarNode('chunk_size')->defaultValue(1420)->end()
-                        ->scalarNode('encoder')->end()
+                        ->enumNode('encoder')->values(['json', 'compressed_json'])->end()
                     ->end()
                     ->validate()
                         ->ifTrue(function ($v) {