Move tag sanitization after checkout in docker-build workflow

[Copilot]

Addresses feedback from PR #1 to reorder steps in the docker-build job for conventional workflow structure.

Changes:

• Moved Sanitize tag step to run after Checkout step in .github/workflows/build.yaml

Workflow ordering:

docker-build:
  steps:
    - name: Checkout              # Now first
    - name: Sanitize tag          # Moved after checkout
    - name: Login to Registry
    - name: Build Image
    - name: Push

While the sanitization step doesn't require repository files, placing checkout first follows GitHub Actions conventions and improves readability.

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