Fix Docker Workflow Validator only running on main repo activity.

[FSG-Cat]

This worked fine when the PR originated in the main repo but did not for external PRs and this workflow is safe for external due to no secrets access.

#1158 was affected by this and this PR should fix that problem.

[changeset-bot]

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Latest commit: 1bf25dd

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[github-actions]

GHCR image refs for this PR:

• Namespace: ghcr.io/the-draupnir-project/draupnir
• Branch tag: FSG-Cat-fix-validator-workflow
• Package Page: GHCR Link
• Pull: docker pull ghcr.io/the-draupnir-project/draupnir:FSG-Cat-fix-validator-workflow

This comment is generated from PR metadata only. It does not checkout or run PR code and is generated in a static manner

[Gnuxie]

@FSG-Cat are you happy with this then