update jenkinsfile

files/config/Jenkinsfile

@@ -1,16 +1,14 @@
 pipeline {
     agent any
 
-    environment {
-        PATH = "/var/jenkins_home/.cargo/bin:${env.PATH}"
-    }
-
     stages {
         stage('CI') {
             steps {
                 withChecks(name: 'Rust CI', includeStage: true) {
                     sh '''
                         set -e
+                        which rustc
+                        which cargo
                         rustc --version
                         cargo --version
                         make ci