Open source the release and changelog feature

[M0nkeySan]

What

In the current Manomano internal project, homer offers the option of publishing and displaying a project's change log using the following commands :

• /homer changelog Generate changelogs for any Gitlab project using release tags.
• /homer release Create a Gitlab release.
• /homer release cancel Cancel a Gitlab release.
• /homer release end End a Gitlab release.

These functionalities should be reviewed and modified to make them available in the open-source project.

How

In order to add a releasable project, an internal configuration file must be modified. This behaviour needs to be reviewed to simplify the process and avoid the need to redeploy homer each time.

Firstly, we should externalise this configuration, and write documentation about it.
Then we could add a command like /homer release enable to register a new releaseable project.

The current configuration is as follows:

{
    notificationChannelIds: [
      IT_DEPLOY_CHANNEL_ID,
      FT_SELLER_CHANNEL_ID,
    ],
    projectId: 1,
    releaseChannelId: FT_SELLER_CHANNEL_ID,
    releaseManager: defaultReleaseManager,
    releaseTagManager: semanticReleaseTagManager,
  },

projectId : Gitlab project ID
notificationChannelIds : ID of the Slack channels that receive notifications about the release
releaseChannelId : ID of the slack channel where the release of the project is enabled
releaseManager : change depending on the type of the project (library, micro-service, frontend ..)
releaseTagManager : defines the tag naming (semantic, stable date ...)

The modal could be like this :

[fleboulch]

I opened this MR before someone is working on this topic