Rails5をCapistrano3でAWSにデプロイしたいです

前提・実現したいこと

Rails5をCapistrano3でAWSにデプロイしたいのですが、SSH接続に失敗しているようで上手くいきません。
Capistranoを導入し、Capfile、production.rb、deploy.rb、task.rb、EC2サーバーの設定とDB作成、Nginxの設定と再起動、git pushしてデプロイを実行すると以下のエラーが表示されてしまいました。
ローカルからssh -i "~/.ssh/test-keygen" ec2-user@54.226.13.75でEC2にSSH接続できています。
またdry-runではエラーは出ていません。

アドバイスをいただけると幸いです。

環境：
Ruby 2.6.3
Rails 5.2.4.3
Capistrano 3.14.1
AWS Linux2
Nginx
Unicorn

設定参考：
(Capistrano編)世界一丁寧なAWS解説。EC2を利用して、RailsアプリをAWSにあげるまで
 Rails5.1.2 + Webpacker + ReactをCapstranoでデプロイする手順書①
Rails5.1.2 + Webpacker + ReactをCapstranoでデプロイする手順書②

発生している問題・エラーメッセージ

$ bundle exec cap production deploy --trace

SSHKit::Runner::ExecuteError: Exception while executing as ec2-user@54.226.13.75: Authentication failed for user ec2-user@54.226.13.75
/usr/local/bundle/gems/sshkit-1.21.0/lib/sshkit/runners/parallel.rb:15:in `rescue in block (2 levels) in execute'
/usr/local/bundle/gems/sshkit-1.21.0/lib/sshkit/runners/parallel.rb:11:in `block (2 levels) in execute'

Caused by:
Net::SSH::AuthenticationFailed: Authentication failed for user ec2-user@54.226.13.75
/usr/local/bundle/gems/net-ssh-6.1.0/lib/net/ssh.rb:268:in `start'
/usr/local/bundle/gems/sshkit-1.21.0/lib/sshkit/backends/connection_pool.rb:63:in `call'
/usr/local/bundle/gems/sshkit-1.21.0/lib/sshkit/backends/connection_pool.rb:63:in `with'
/usr/local/bundle/gems/sshkit-1.21.0/lib/sshkit/backends/netssh.rb:177:in `with_ssh'
/usr/local/bundle/gems/sshkit-1.21.0/lib/sshkit/backends/netssh.rb:130:in `execute_command'
/usr/local/bundle/gems/sshkit-1.21.0/lib/sshkit/backends/abstract.rb:148:in `block in create_command_and_execute'
/usr/local/bundle/gems/sshkit-1.21.0/lib/sshkit/backends/abstract.rb:148:in `tap'
/usr/local/bundle/gems/sshkit-1.21.0/lib/sshkit/backends/abstract.rb:148:in `create_command_and_execute'
/usr/local/bundle/gems/sshkit-1.21.0/lib/sshkit/backends/abstract.rb:61:in `test'
/usr/local/bundle/gems/capistrano-rbenv-2.2.0/lib/capistrano/tasks/rbenv.rake:10:in `block (3 levels) in <top (required)>'
/usr/local/bundle/gems/sshkit-1.21.0/lib/sshkit/backends/abstract.rb:31:in `instance_exec'
/usr/local/bundle/gems/sshkit-1.21.0/lib/sshkit/backends/abstract.rb:31:in `run'
/usr/local/bundle/gems/sshkit-1.21.0/lib/sshkit/runners/parallel.rb:12:in `block (2 levels) in execute'
Tasks: TOP => rbenv:validate

該当のソースコード

(Capfile)
require 'capistrano/setup'
require 'capistrano/deploy'
require 'capistrano/rbenv'
require 'capistrano/bundler'
require 'capistrano/rails/assets'
require 'capistrano/rails/migrations'

Dir.glob('lib/capistrano/tasks/*.rb').each { |r| import r }

(config/deploy/production.rb)
server '54.226.13.75', user: 'ec2-user', roles: %w{app db web}

set :ssh_options, keys: '~/.ssh/test-keygen'

(config/deploy.rb)
lock '3.14.1'

set :application, 'capistrano-deploy'

set :repo_url, 'git@github.com:****/capistrano-deploy.git'

set :branch, 'master'

set :deploy_to, '/var/www/rails'

set :linked_files, fetch(:linked_files, []).push('config/settings.yml')

set :linked_dirs, fetch(:linked_dirs, []).push('log', 'tmp/pids', 'tmp/cache', 'tmp/sockets', 'vendor/bundle', 'public/system')

set :keep_releases, 5

set :rbenv_ruby, '2.6.3'

set :log_level, :debug

namespace :deploy do
  desc 'Restart application'
  task :restart do
    invoke 'unicorn:restart'
  end

  desc 'Create database'
  task :db_create do
    on roles(:db) do |host|
      with rails_env: fetch(:rails_env) do
        within current_path do
          execute :bundle, :exec, :rake, 'db:create'
        end
      end
    end
  end

  desc 'Run seed'
  task :seed do
    on roles(:app) do
      with rails_env: fetch(:rails_env) do
        within current_path do
          execute :bundle, :exec, :rake, 'db:seed'
        end
      end
    end
  end

  after :publishing, :restart

  after :restart, :clear_cache do
    on roles(:web), in: :groups, limit: 3, wait: 10 do
    end
  end
end

EC2内 
(shared/config/settings.yml)
production:
  secret_key_base: ローカルでrake secretで作成した乱数

EC2内
(/etc/nginx/conf.d/capistrano-deploy.conf)
error_log  /var/www/rails/capistrano-deploy/current/log/nginx.error.log;
access_log /var/www/rails/capistrano-deploy/current/log/nginx.access.log;

client_max_body_size 2G;
upstream app_server {
  server unix:/var/www/rails/capistrano-deploy/current/tmp/sockets/.unicorn.sock fail_timeout=0;
}
server {
  listen 80;
  server_name 自分のIPアドレス;
  keepalive_timeout 5;
  root /var/www/rails/capistrano-deploy/current/public;
  try_files $uri/index.html $uri.html $uri @app;
  location @app {
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header Host $http_host;
    proxy_redirect off;
    proxy_pass http://app_server;
  }
  error_page 500 502 503 504 /500.html;
  location = /500.html {
    root /var/www/rails/capistrano-deploy/current/public;
  }
}

mysql> SHOW DATABASES;
+------------------------------+
| Database                     |
+------------------------------+
| information_schema           |
| capistrano_deploy_production |
| mysql                        |
| performance_schema           |
+------------------------------+

(lib/capistrano/tasks/unicorn.rb)
namespace :unicorn do
  task :environment do
    set :unicorn_pid,    "#{current_path}/tmp/pids/unicorn.pid"
    set :unicorn_config, "#{current_path}/config/unicorn/production.rb"
  end

  def start_unicorn
    within current_path do
      execute :bundle, :exec, :unicorn, "-c #{fetch(:unicorn_config)} -E #{fetch(:rails_env)} -D"
    end
  end

  def stop_unicorn
    execute :kill, "-s QUIT $(< #{fetch(:unicorn_pid)})"
  end

  def reload_unicorn
    execute :kill, "-s USR2 $(< #{fetch(:unicorn_pid)})"
  end

  def force_stop_unicorn
    execute :kill, "$(< #{fetch(:unicorn_pid)})"
  end

  desc "Start unicorn server"
  task start: :environment do
    on roles(:app) do
      start_unicorn
    end
  end

  desc "Stop unicorn server gracefully"
  task stop: :environment do
    on roles(:app) do
      stop_unicorn
    end
  end

  desc "Restart unicorn server gracefully"
  task restart: :environment do
    on roles(:app) do
      if test("[ -f #{fetch(:unicorn_pid)} ]")
        reload_unicorn
      else
        start_unicorn
      end
    end
  end

  desc "Stop unicorn server immediately"
  task force_stop: :environment do
    on roles(:app) do
      force_stop_unicorn
    end
  end
end

(config/unicorn/production.rb)
$worker  = 2
  $timeout = 30
  $app_dir = "/var/www/capistrano-deploy/current"
  $listen  = File.expand_path 'tmp/sockets/.unicorn.sock', $app_dir
  $pid     = File.expand_path 'tmp/pids/unicorn.pid', $app_dir
  $std_log = File.expand_path 'log/unicorn.log', $app_dir

  worker_processes  $worker
  working_directory $app_dir
  stderr_path $std_log
  stdout_path $std_log
  timeout $timeout
  listen  $listen
  pid $pid

  preload_app true

  before_fork do |server, worker|
    defined?(ActiveRecord::Base) and ActiveRecord::Base.connection.disconnect!
    old_pid = "#{server.config[:pid]}.oldbin"
    if old_pid != server.pid
      begin
        Process.kill "QUIT", File.read(old_pid).to_i
      rescue Errno::ENOENT, Errno::ESRCH
      end
    end
  end

  after_fork do |server, worker|
    defined?(ActiveRecord::Base) and ActiveRecord::Base.establish_connection
  end

(config/database.yml)
production:
  adapter: mysql2
  encoding: utf8
  pool: 5
  database: capistrano_deploy_production
  username: root
  password:
  socket: /var/lib/mysql/mysql.sock