Repo Mirror on PR via Actions

Hi there,

we have a workflow setup which triggers on PRs…
This is using pixta-dev/repository-mirroring-action@v1 to mirror repo to another private internal git, and requires an SSH key.
We added a secret for it, and try to call it within the workflow as:

          ${{ secrets.SSH_PRIVATE_KEY }}

But the workflow always fail with the following:

Load key "/github/home/.ssh/id_rsa": invalid format

Checking the Secrets GH docs, the following is showing up:

**Note:** With the exception of GITHUB_TOKEN , secrets are not passed to the runner when a workflow is triggered from a forked repository.

So I’m I correct this is not working in our setup?
With the error received I would assume the secrets.SSH_PRIVATE_KEY is never populated because of the way we try to use the workflow.

Can anybody confirm this is the case, or know a way how to do it?

Many thanks,