feat: Tag pruner action (SOFIE-1140) - #1

Jira: https://nrknyemedier.atlassian.net/browse/SOFIE-1140

Create a generic action that can be used to prune tags from GitHub repositories based on age with an optional Regex filter.

Once merged the repo will need tagging with a suitable tag E.G. v1 or tag-pruner-v1 so that the action can be called in other repos: nrkno/sofie-github-workflows/.github/actions/tag-pruner@v1

An example workflow to delete tags older than 30 days that runs weekly could be:

on:
  schedule:
    - cron: '0 0 * * 0'
name: Tidy up repo tags
jobs:
  prune:
    name: Prune tags
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3
        with:
          fetch-depth: 0
      - uses: nrkno/sofie-github-workflows/.github/actions/tag-pruner@v1
        with:
          older-than: 30
          ignore: v[0-9]+\.[0-9]+\.[0-9]+.*