Use Vagrant trigger to execute bash script on host

You can run your script directly using the run instructions

[:up, :provision].each do |cmd|
    config.trigger.before cmd, stdout: true do
      run "Vagrant_trigger_before.sh"
    end
end

After trigger plugin was merged to vagrant mainline, the syntax seems to be changed to

config.trigger.before :up, :provision do |trigger|
  trigger.run = {inline: "Vagrant_trigger_before.sh"}
end

Ref: https://www.vagrantup.com/docs/triggers/configuration#inline