ci: improve pipeline parameters defaults handling

vars/continuousIntegrationPipeline.groovy

@@ -34,7 +34,10 @@ def call(Map pipelineParams = [:]) {
         sonar: [ enable: false, projectKey: null, tokenId: null, exclusions: "tests/**/*,**/*.xml,**/*.yml", testExclusions: "**/*" ],
         pushArtifacts: true
     ]
-    pipelineParams = defaultParameters << pipelineParams
+    pipelineParams = deepMerge(defaultParameters, pipelineParams)
+
+    // Pretty print the final pipeline parameters
+    echo "Pipeline parameters: ${groovy.json.JsonOutput.prettyPrint(groovy.json.JsonOutput.toJson(pipelineParams))}"
 
     stage ("Pipeline parameters check") {
         // Print effective pipeline parameters for debugging

vars/deepMerge.groovy

@@ -0,0 +1,12 @@
+// Nested maps merger
+def call(Map defaults, Map overrides) {
+    def result = [:] + defaults
+    overrides.each { k, v ->
+        if (result[k] instanceof Map && v instanceof Map) {
+            result[k] = deepMerge(result[k] as Map, v as Map)
+        } else {
+            result[k] = v
+        }
+    }
+    return result
+}