runTask: Switch post-tasks to Post section

vars/runTask.groovy

@@ -52,12 +52,12 @@ def call(String task, String branch, String repo, String phpversion, String data
                 }
             }
 
-            stage("Post") {
-                steps {
-                    junit allowEmptyResults: true, testResults: '${env.BUILD_ID}/*.junit/*.xml,${env.BUILD_ID}/*.junit'
-                    archiveArtifacts allowEmptyArchive: true, artifacts: '${env.BUILD_ID}/**'
-                    cleanWs deleteDirs: true, notFailBuild: true
-                }
+        }
+        post {
+            always {
+                junit allowEmptyResults: true, testResults: '${env.BUILD_ID}/*.junit/*.xml,${env.BUILD_ID}/*.junit'
+                archiveArtifacts allowEmptyArchive: true, artifacts: '${env.BUILD_ID}/**'
+                cleanWs deleteDirs: true, notFailBuild: true
             }
         }
     }