fix: recursively merge default values

CHANGELOG.md

@@ -9,6 +9,7 @@
 ### Fixed
 
 * The `pre-push` Git hook should use `./run test:commit` instead of `just test-commit` since `just` is no longer used.
+* Recursively merge `build.defaults.yaml` into the given configuration.
 
 ## 2023-11-22
 

src/Action/CreateFinalConfigurationData.php

@@ -10,7 +10,7 @@ use Symfony\Component\Yaml\Yaml;
 final class CreateFinalConfigurationData
 {
     public function handle(string $configFile, \Closure $next) {
-        $configurationData = array_merge(
+        $configurationData = array_replace_recursive(
             Yaml::parseFile(filename: __DIR__ . '/../../resources/build.defaults.yaml'),
             Yaml::parseFile(filename: $configFile),
         );