pkgdown: git error at Deploy package

[culpinnis]

Describe the bug
Using the pkgdown action results in an error at the "Deploy package" step.
This error is caused by git:
7_Deploy package.txt

The workflow was still working on 9th March, today I changed only one word in the Readme and the workflow was not working successfully anymore.

To Reproduce
Today I copied the example workflow entirely from here to provide good reproducibility. We used a slightly different version before which resulted in the same error.
A not successful run can be found here: https://github.com/ipb-halle/GoldenMutagenesis/runs/877467931 based on this yaml: https://github.com/ipb-halle/GoldenMutagenesis/blob/master/.github/workflows/pkgdown.yml

Expected behaviour
Documentation should be built and published.

Thanks,
Chris

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