Workaround build-push-action download-artifact incompatibility

[GDYendell]

• v6 cannot be used with actions/download-artifact@v4 docker/build-push-action#1167
• https://docs.docker.com/build/ci/github-actions/build-summary/#disable-build-record-upload

Working build: https://github.com/DiamondLightSource/eiger-fastcs/actions/runs/10183281687/job/28167943885

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.16%. Comparing base (a15718e) to head (aff074d).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #42   +/-   ##
=======================================
  Coverage   71.16%   71.16%           
=======================================
  Files           4        4           
  Lines         274      274           
=======================================
  Hits          195      195           
  Misses         79       79           

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