wheneverでbin: bash: command not foundのエラー

前提・実現したいこと

ECサイトのコピーサイトをrailsで作成中です。
現在は出品フォームを作っており,
ActiveStorageを使ったダイレクトアップロードで画像をS3にアップロードしているのですが、その際にバリデーションにかからず先に保存されてしまった画像データを定期処理で削除する機能をwheneverを使って実装したいです。
EC2にcapistranoで自動デプロイをする際に以下のエラー文が表示されます。

発生している問題・エラーメッセージ

~中略~
00:25 whenever:update_crontab
      01 bundle exec whenever
      01 bash: bundle: コマンドが見つかりません
#<Thread:0x00007fd2ba332d38@/Users/nagisa/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/sshkit-1.19.1/lib/sshkit/runners/parallel.rb:10 run> terminated with exception (report_on_exception is true):
Traceback (most recent call last):
    1: from /Users/nagisa/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/sshkit-1.19.1/lib/sshkit/runners/parallel.rb:11:in `block (2 levels) in execute'
/Users/nagisa/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/sshkit-1.19.1/lib/sshkit/runners/parallel.rb:15:in `rescue in block (2 levels) in execute': Exception while executing as ec2-user@52.199.29.90: bundle exec whenever exit status: 127 (SSHKit::Runner::ExecuteError)
bundle exec whenever stdout: Nothing written
bundle exec whenever stderr: bash: bundle: コマンドが見つかりません
(Backtrace restricted to imported tasks)
cap aborted!
SSHKit::Runner::ExecuteError: Exception while executing as ec2-user@52.199.29.90: bundle exec whenever exit status: 127
bundle exec whenever stdout: Nothing written
bundle exec whenever stderr: bash: bundle: コマンドが見つかりません


Caused by:
SSHKit::Command::Failed: bundle exec whenever exit status: 127
bundle exec whenever stdout: Nothing written
bundle exec whenever stderr: bash: bundle: コマンドが見つかりません

Tasks: TOP => whenever:update_crontab
(See full trace by running task with --trace)
The deploy has failed with an error: Exception while executing as ec2-user@52.199.29.90: bundle exec whenever exit status: 127
bundle exec whenever stdout: Nothing written
bundle exec whenever stderr: bash: bundle: コマンドが見つかりません


** DEPLOY FAILED
** Refer to log/capistrano.log for details. Here are the last 20 lines:


 DEBUG [d4eb63e2] Running /usr/bin/env ls /var/www/sample_application/releases/20190716053117/public/assets/.sprockets-manifest* as ec2-user@52.199.29.90

 DEBUG [d4eb63e2] Command: cd /var/www/sample_application/releases/20190716053117 && ( export RBENV_ROOT="$HOME/.rbenv" RBENV_VERSION="2.5.1" ; /usr/bin/env ls /var/www/sample_application/releases/20190716053117/public/assets/.sprockets-manifest* )

 DEBUG [d4eb63e2]     /var/www/sample_application/releases/20190716053117/public/assets/.sprockets-manifest-9e81b2a8913c784fc51a180bf21eb31a.json

 DEBUG [d4eb63e2] Finished in 0.243 seconds with exit status 0 (successful).

  INFO [1a6a0756] Running /usr/bin/env cp /var/www/sample_application/releases/20190716053117/public/assets/.sprockets-manifest-9e81b2a8913c784fc51a180bf21eb31a.json /var/www/sample_application/releases/20190716053117/assets_manifest_backup as ec2-user@52.199.29.90

 DEBUG [1a6a0756] Command: cd /var/www/sample_application/releases/20190716053117 && ( export RBENV_ROOT="$HOME/.rbenv" RBENV_VERSION="2.5.1" ; /usr/bin/env cp /var/www/sample_application/releases/20190716053117/public/assets/.sprockets-manifest-9e81b2a8913c784fc51a180bf21eb31a.json /var/www/sample_application/releases/20190716053117/assets_manifest_backup )

  INFO [1a6a0756] Finished in 0.133 seconds with exit status 0 (successful).

  INFO [deploy:migrate] Run `rake db:migrate`

 DEBUG [9b41128b] Running if test ! -d /var/www/sample_application/releases/20190716053117; then echo "Directory does not exist '/var/www/sample_application/releases/20190716053117'" 1>&2; false; fi as ec2-user@52.199.29.90

 DEBUG [9b41128b] Command: if test ! -d /var/www/sample_application/releases/20190716053117; then echo "Directory does not exist '/var/www/sample_application/releases/20190716053117'" 1>&2; false; fi

 DEBUG [9b41128b] Finished in 0.175 seconds with exit status 0 (successful).

  INFO [d6df91df] Running $HOME/.rbenv/bin/rbenv exec bundle exec rake db:migrate as ec2-user@52.199.29.90

 DEBUG [d6df91df] Command: cd /var/www/sample_application/releases/20190716053117 && ( export RBENV_ROOT="$HOME/.rbenv" RBENV_VERSION="2.5.1" RAILS_ENV="production" ; $HOME/.rbenv/bin/rbenv exec bundle exec rake db:migrate )

  INFO [d6df91df] Finished in 2.028 seconds with exit status 0 (successful).

 DEBUG [59d16d17] Running if test ! -d /var/www/sample_application/releases/20190716053117; then echo "Directory does not exist '/var/www/sample_application/releases/20190716053117'" 1>&2; false; fi as ec2-user@52.199.29.90

 DEBUG [59d16d17] Command: if test ! -d /var/www/sample_application/releases/20190716053117; then echo "Directory does not exist '/var/www/sample_application/releases/20190716053117'" 1>&2; false; fi

 DEBUG [59d16d17] Finished in 0.109 seconds with exit status 0 (successful).

  INFO [4fe0898a] Running bundle exec whenever as ec2-user@52.199.29.90

 DEBUG [4fe0898a] Command: bundle exec whenever

 DEBUG [4fe0898a]     bash: bundle: コマンドが見つかりません

該当のソースコード

bundle exec whenever stderr: bash: bundle: コマンドが見つかりません

試したこと

wheneverの設定項目について調べ、デフォルトだとrbenvでインストールしたRubyで実行されないためにschedule.rbに設定を追加する必要があるとのことがわかりました。
参考：wheneverで/bin/bash: bundle: command not foundエラー
env :PATH, ENV['PATH']を追加しましたが解決せず、job_typeも自分の環境に合わせて設定したのですが上手く行かず、ここが原因だとは思うのですが具体的にどう直せばいいかわからずにいます。

ヒントや具体的な設定の仕方が書いてあるサイト等ありましたら教えて頂けるとありがたいです。
どうぞよろしくおねがいします。

env :PATH, ENV['PATH']
require File.expand_path(File.dirname(__FILE__) + "/environment")
set :output, '/var/www/sample_application/shared/log/crontab.log'
job_type :runner, "export PATH=\"$HOME/.rbenv/bin:$PATH\"; eval \"$(rbenv init -)\"; cd :path && RAILS_ENV=:environment bundle exec rails runner :task ：output"

every 1.day at: '11:00 am' do
  runner "ActiveStorage::Blob.unattached.find_each(&:purge_later)"
end

[ec2-user@]$gem environment
RubyGems Environment:
  - RUBYGEMS VERSION: 2.7.6
  - RUBY VERSION: 2.5.1 (2018-03-29 patchlevel 57) [x86_64-linux]
  - INSTALLATION DIRECTORY: /home/ec2-user/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0
  - USER INSTALLATION DIRECTORY: /home/ec2-user/.gem/ruby/2.5.0
  - RUBY EXECUTABLE: /home/ec2-user/.rbenv/versions/2.5.1/bin/ruby
  - EXECUTABLE DIRECTORY: /home/ec2-user/.rbenv/versions/2.5.1/bin
  - SPEC CACHE DIRECTORY: /home/ec2-user/.gem/specs
  - SYSTEM CONFIGURATION DIRECTORY: /home/ec2-user/.rbenv/versions/2.5.1/etc

補足情報（FW/ツールのバージョンなど）

rails 5.2.3
ruby 2.5.1
mysql
capistrano
nginx unicorn
EC2

参考サイト

https://easyramble.com/whenever-bundle-error.html
http://karur4n.hatenablog.com/entry/2015/03/10/192740