Document forked repo image publishing

README.md

@@ -166,6 +166,14 @@ See [here](docs/observability.md)
 * Add a webhook to repo setting (don't forget the `/webhook` path in the URL).
 * Content type needs to be `application/json`, **currently** only PR events are needed
 
+To publish container images from a forked repo set the `IMAGE_NAME` and `REGISTRY` GitHub Action Repository variables to use GitHub packages.
+`REGISTRY` should be `ghcr.io` and `IMAGE_NAME` should match the repository slug, like so:
+like so:
+<img width="785" alt="image" src="https://github.com/commercetools/telefonistka/assets/1616153/2f7201d6-fdb2-4cbf-8705-d6da7f4f6e80">
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+
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 ## Roadmap
 
 See the [open issues](https://github.com/wayfair-incubator/telefonistka/issues) for a list of proposed features (and known issues).