Use labels to automatically assign milestones

[ghostwriter]

Using 3 labels to identify major,minor,patch changes a given PR introduces.

Using the git to identify the latest tag.

Latest version: "1.2.3"

If a PR is labeled patch the PR is assigned milestone "1.2.4"

If a PR is labeled minor the PR is assigned milestone "1.3.0"

If a PR is labeled major the PR is assigned milestone "2.0.0"

If a PR is labeled {major|minir|patch} and it already has a {major|minir|patch} label; it will remove and overwrite the previous label. (also updates the PRs milestone)

[ghostwriter]

on:
  issues:
    types: [labeled, unlabeled]
  pull_request_target:
    types: [labeled, unlabeled]
  discussion:
    types: [labeled, unlabeled]

permissions:
  contents: read
  issues: write
  pull-requests: write
  discussions: write