title: fastlane: command not found in Jenkins Pipeline
body: <p>I'm using the Jenkins pipeline to check out my code, build and release my app using the HockeyApp tool. For all the above steps I want to use Fastlane commands and they should be executed using shell script in declarative pipeline syntax. How can I achieve this? Below is my declarative pipeline script.</p>
  <p>Where should I configure the Fastlane path? Should it be done inside Jenkins configuration or somewhere else? Please help me out.</p>
  <p>Thanks</p>
  <pre><code>  pipeline {
        agent any
  
         stages {
              stage('First Stage Cocoapods Install') {
                  steps {
                  echo 'Hi, this is first jenkins pipeline stage.'
               /*checkout([$class: 'GitSCM', branches: [[name: '*/master']], doGenerateSubmoduleConfigurations: false, extensions: [], submoduleCfg: [], userRemoteConfigs: [[credentialsId: 'Bitbucket', url: 'https://********@bitbucket.org/*****/******.git']]])*/
  
                  // Mark the cocoapods 'stage'....
                   sh &quot;fastlane pods&quot;   
  
                  }
              }
  
              stage('Second Stage Build the App') {
                  steps {
                  echo 'Hi, this is Second jenkins pipeline stage.'
                  sh &quot;fastlane gym&quot;
                  }
              }
              stage('Three Stage') {
                  steps {
                  echo 'Hi, this is Third jenkins pipeline stage.'
                  }
              }
  
              stage('Four Stage') {
                  steps {
                  echo 'Hi, this is fourth jenkins pipeline stage.'
                  }
              }
          }
  } 
  </code></pre>