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action_mailer.default_url_options not working for staging environment

Subrat Rout •
When I am deploying to Hetzner using Capistrano deployment with RAILS_ENV=staging, the "Forgot password" page (/users/password/new) returns an error 500:

ActionView::Template::Error
Missing host to link to! Please provide the :host parameter, set default_url_options[:host], or set :only_path to true

from app/views/devise/mailer/reset_password_instructions.html.erb at line 5:

<p><%= link_to t('.action'), edit_password_url(@resource, reset_password_token: @token) %></p>

---

This works fine in development.
For development:
action_mailer.default_url_options[:host] is set in config/environments/development.rb:

config.action_mailer.default_url_options = {host: "lvh.me", port: ENV.fetch("PORT", 3000).to_i}

For staging:
config/initializers/mail.rb seems to set default_url_options[:host] as well:
So I changed it to following:
Rails.application.reloader.to_prepare do
  ActionMailer::Base.default_options = {from: Jumpstart.config.default_from_email}

  if Rails.env.production?
    ActionMailer::Base.default_url_options[:host] = Jumpstart.config.domain
    ActionMailer::Base.smtp_settings.merge!(Jumpstart::Mailer.new(Jumpstart.config).settings)
  end

  if Rails.env.staging?
    ActionMailer::Base.default_url_options[:host] = Rails.application.config.action_mailer.default_url_options[:host]
    ActionMailer::Base.smtp_settings.merge!(Jumpstart::Mailer.new(Jumpstart.config).settings)
  end

end

For staging:
I have manually edited config/environments/staging.rb to add this.

config.action_mailer.default_url_options = {host: "mydomain.com"}
When I am going to server rails console and typing  following:
ActionMailer::Base.default_url_options[:host]
I am getting the expected domain evaluated however I am still getting 500 errors for password reset request.
Please help.
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