use version instead of date

Gemfile

@@ -30,6 +30,6 @@ group :test do
   gem 'rubocop', require: false
 
   gem 'ruby_audit', '~> 2.2'
-end
 
   gem 'bundle-audit', '~> 0.1.0'
+end

Jenkinsfile

@@ -102,7 +102,7 @@ pipeline {
       steps {
         catchError(buildResult: 'FAILURE', stageResult: 'FAILURE') {
           sh ''' #!/usr/local/bin/bash
-            ZIP_FILE="url-shortener_${BRANCH_NAME}_$(date "+%Y-%m-%d_%H-%M-%S").tgz"
+            ZIP_FILE="url-shortener_${BRANCH_NAME}_$(cat VERSION).tgz"
             CUR_DIR=$(pwd)
             bundle config set --local without 'test'
             bundle config set --local path "vendor"

VERSION

@@ -0,0 +1 @@
+VERSION = '1.0.0'