added rubocop linting section with output for reports and clean up

rubocop config

Jenkinsfile

@@ -20,6 +20,9 @@ pipeline {
         sh 'sequel -m db/migrations sqlite://db/${DB_NAME}'
       }
     }
+    stage('Code Linting') {
+      sh 'bundle exec rubocop --format html --out rubocop.html'
+    }
     stage('Run tests') {
       steps {
         catchError(buildResult: 'UNSTABLE', stageResult: 'FAILURE') {
@@ -37,9 +40,9 @@ pipeline {
           alwaysLinkToLastBuild: false,
           keepAll: true,
           reportDir: '.',
-          reportFiles: 'cucumber.html, spec.html, coverage/index.html',
+          reportFiles: 'rubocop.html, cucumber.html, spec.html, coverage/index.html',
           reportName: 'Test Results',
-          reportTitles: 'Cucumber Results, RSpec Results, Test Coverage'])
+          reportTitles: 'Rubocop Results, Cucumber Results, RSpec Results, Test Coverage'])
       }
     }
     stage('Build production deliverable') {
@@ -53,7 +56,7 @@ pipeline {
             cp .env.rb /tmp/url-shortener/
             cp .ruby-version /tmp/url-shortener/
             cd /tmp/url-shortener
-            rm -rf features spec coverage db/*.db .git* Jenkinsfile *.html
+            rm -rf features spec coverage db/*.db .git* Jenkinsfile *.html .rubocop.yml
             cd /tmp
             tar -czvf $ZIP_FILE url-shortener/
             mv /tmp/$ZIP_FILE $CUR_DIR/