Label PRs with modified addons

[sbidoul]

closes #265

This adds a addon:{addon_name} and a series:{branch_name} labels. Note: distinguishing by modification type can be added later.

With this it should become much easier to write tools to be notified about modifications to addons of interest.

[hhgabelgaard]

@sbidoul Why not use Milestone for the branch series tagging?
Like its done with the migration issues
And manually in som OCA repos

[sbidoul]

Why not use Milestone for the branch series tagging? Like its done with the migration issues And manually in som OCA repos

We could and probably should.

But I always have been thinking that this is a misuse of Milestones which are meant to manage the next release of a project. On small repos like MIS Builder I have sometimes used the milestone to that end.