ci: fix release docker workflow

[Borda]

What does this PR do?

debugging failing https://github.com/Lightning-AI/lightning/actions/runs/5875926710/job/15933080096

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cc @carmocca @Borda @tchaton

[Borda]

could help: https://stackoverflow.com/questions/75051895/docker-build-failed-in-github-actions-failed-to-read-dockerfile
wrong reply: docker/for-win#8781 (comment)

[github-actions]

⚡ Required checks status: All passing 🟢

Groups summary

🟢 release dockers

Check ID	Status
publish-docker (3.9, 1.13, 12.0.1)	success	✅
publish-docker (3.9, 1.13, 12.0.1)	success	✅
publish-docker (3.10, 2.0, 11.8.0)	success	✅
publish-docker (3.10, 2.0, 12.0.1)	success	✅

These checks are required after the changes to .github/workflows/release-docker.yml.

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Thank you for your contribution! 💜

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