jenkinsfile: prepare steps

Change-Id: If54b46f1f1c7629a728a97d0803d986d3d5cecd9

extras/ci/client-qt-gnulinux/Jenkinsfile

@@ -53,6 +53,8 @@ pipeline {
 
     stages {
         stage('SCM Checkout') {
+            steps {
+                script {
                     deleteDir()
                     // Checkout jami-project to obtain daemon/LRC/client-qt repositories
                     sh """
@@ -69,14 +71,23 @@ pipeline {
                         git submodule update --init --recursive
                         cd ..
                     """
-            topDir = pwd() + '/jami-project'
+                }
+            }
         }
 
-        dir (topDir) {
         stage('Building Docker Image') {
+            steps {
+                dir (pwd() + '/jami-project') {
+                    script {
                         docker.build('client-validation', "-f client-qt/extras/build/docker/Dockerfile.client-qt-gnulinux --no-cache .")
                     }
+                }
+            }
+        }
 
+        stage('Build project') {
+            steps {
+                script {
                     def jenkinsUID = sh(returnStdout: true, script: 'id -u jenkins').replaceAll("\n", '').trim()
                     def jenkinsGID = sh(returnStdout: true, script: 'id -g jenkins').replaceAll("\n", '').trim()
                     def jenkinsUser = jenkinsUID+':'+jenkinsGID
@@ -93,6 +104,8 @@ pipeline {
                             def installDir = dockerTopDir + '/install'
 
                             stage('Build Client') {
+                                steps {
+                                    script {
                                         ansiColor('css') {
                                             exec_cmd("""
                                                 cd ${clientDir}
@@ -108,8 +121,12 @@ pipeline {
                                             """)
                                         }
                                     }
+                                }
+                            }
 
                             stage('Run Tests') {
+                                steps {
+                                    script {
                                         ansiColor('css') {
                                             exec_cmd("""
                                                 cd ${clientDir}
@@ -123,3 +140,8 @@ pipeline {
                         }
                     }
                 }
+            }
+        }
+        }
+    }
+}