Apply workflow example does not work for private repositories.

[anton-lunden]

Running the apply workflow example in a private repository results in the following error:

==> Repository: **redacted**
==> Artifact name: pgschema-plan-64
==> Local path: .
==> Workflow name: pgschema-multifile-plan.yml
==> Workflow conclusion: success
==> PR: 64
==> Commit: ...
==> Allow forks: false
Error: Resource not accessible by integration - https://docs.github.com/rest/actions/workflow-runs#list-workflow-runs-for-a-workflow

The download artifact action used in the example apply workflows seems to rely on listing workflow runs. As described in the documentation, unless the resources are public, the actions: read permission must be set.

I would suggest adding to both apply workflow permissions (single, multi):
actions: read # Required if repository is private

If you agree with this analysis, let me know and I can create a PR.