feat!: migrate clean-ghcr workflow to use GH token #50
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Since https://github.com/snok/container-retention-policy/releases/tag/v2.2.0 (snok/container-retention-policy#70) https://github.com/snok/container-retention-policy supports using GH token to authenticate. This allows us to avoid using PATs.
Using the GH token only works for a single image matching the repository that runs the action. This is also how we use this action right now, ref. https://github.com/search?q=org%3Astatnett%20clean-ghcr.yaml&type=code
BREAKING CHANGE: Calling workflows have to remove use of removed parameters