Delete old github tags

GitHub action to delete old tags from docker registry.

It will:

1. Fetch all tags for specified image
2. Extract semver versions from them. If extraction fails, tag will be ignored (so latest and other tags like it will be safe)
3. Sort extracted versions in descending order
4. Deletes all tags below keep-last position in sorted list. This deletes manifests too, so if deleted tag points to latest manifest, these two tags will be deleted

Inputs

Name	Description	Required	Default
registry	Registry URL (with http/https)	✔️
username	Username to login into registry	✔️
password	Password to login into registry	✔️
repository	Repository/image name to fetch tags from	✔️
keep-last	How much versions to keep		10
version-extractor	Regex to extract SemVer version from tag		v?(\d+(.\d+)*)

Example usage

Keep 10 last versions of image

uses: alesharik/[email protected]
with:
  registry: https://registry.url
  username: ${{ secrets.DOCKER_USERNAME }}
  password: ${{ secrets.DOCKER_PASSWORD }}
  repository: test

Keep 5 last versions of image

uses: alesharik/[email protected]
with:
  registry: https://registry.url
  username: ${{ secrets.DOCKER_USERNAME }}
  password: ${{ secrets.DOCKER_PASSWORD }}
  repository: test
  keep-last: 5

Keep 5 last versions of dev images

uses: alesharik/[email protected]
with:
  registry: https://registry.url
  username: ${{ secrets.DOCKER_USERNAME }}
  password: ${{ secrets.DOCKER_PASSWORD }}
  repository: test
  keep-last: 5
  version-extractor: 'v?(\d+(.\d+)*)-dev'