Add actions to generate new version's necessary information for Backend.ai users at the release point.

## Motivation  

- It is difficult for users to find out additional configurations and APIs due to the new version update situation.

## Objective  

- It makes it easy to check new features when a new version is released.

## Details  

1. We need to discuss how I can provide functions for you.

## Impact  

- User can easily check the changes with the new version update.

JIRA Issue: BA-785