add check for rkfill to jenkinsfile

api/Jenkinsfile.ble_test

@@ -51,9 +51,9 @@ pipeline {
         }
 
         // ---------------------------------------------------------------------
-        // 2. Ensure screen is installed 
+        // 2. Ensure apps are installed 
         // ---------------------------------------------------------------------
-        stage('Ensure screen is present') {
+        stage('Ensure apps are present') {
             steps {
                 sshagent([env.SSH_CREDENTIALS_ID]) {
                     sh """
@@ -63,6 +63,11 @@ pipeline {
                             echo ==MC== "screen not found - installing"
                             apt-get update && apt-get install -y screen
                         fi
+                        echo ==MC== Checking for rfkill application...
+                        if ! command -v rfkill > /dev/null; then
+                            echo ==MC== "rfkill not found - installing"
+                            apt-get update && apt-get install -y rfkill
+                        fi
                     """
                 }
             }