Image tagging when using metadata action not working

[martinjh99]

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Given this workflow file - https://github.com/martinjh99/astro-site/blob/main/.github/workflows/docker-publish.yml

These are the logs for the relevant bits of my workflow - https://files.mjhooper.co.uk/s/bCBCLBL3k5imPAi

Why does the build and upload action give me an
Error: buildx failed with: ERROR: invalid tag "martinjh99/astro-site:martinjh99/astro-site:sha-de6efdb": invalid reference format

How do I change what gets passed into the build and publish action?

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