JenkinsPipeLine: add Proxy disable toggle

CT-Build/Alpine.Jenkinsfile

@@ -7,6 +7,7 @@ pipeline {
         string defaultValue: '0', description: 'Set amount of core\'s ZX is allowed when compressing (use 0 for all cores)', name: 'ZX_Cores'
         booleanParam description: 'Only build specified variant', name: 'OneRun'
         string defaultValue: 'VariantName', description: 'Variant for OneBuild', name: 'OneRunVariant'
+        booleanParam description: 'Disable of Proxy server for package repos ', name: 'DisProxy'
     }
     options {
         skipDefaultCheckout()
@@ -26,6 +27,12 @@ pipeline {
                 mv distrobuilder-* distrobuilder
                 bash Scripts/GetExternalResources.sh
                 '''
+                //Check if Proxy is disabled
+                script{                       
+                    if (env.DisProxy == 'true') {
+                        sh '''bash Scripts/UpdateIMGBuildFile-CacheAndRepo.sh -d'''
+                    }
+                } 
             }
         }
         stage('Image Configs'){