chore: dos-games dockerhub image to ghcr

[AustinAbro321]

Description

We moved away from dockerhub for most of our images to avoid TOOMANYREQUEST flakes in actions, but forgot about this one

Checklist before merging

• [ ] Test, docs, adr added or updated as needed
• [ ] Contributor Guide Steps followed

[netlify[bot]]

✅ Deploy Preview for zarf-docs canceled.

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

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