Test setup-buildx

Workflow runs for Test setup-buildx

• chore: pin actions/checkout to a commit SHA in all workflows

  completed successfully:
  Test setup-buildx#3:Commitf1054ffpushedbyamannocci
  main

  Oct 22, 202622s
  More actions for workflow run 3

• feat: pin default tool versions in setup-qemu, setup-buildx and setup-uv

  failed:
  Test setup-buildx#2:Commita986eacpushedbyamannocci
  main

  Oct 22, 20266s
  More actions for workflow run 2

• feat: add setup-qemu, setup-buildx and setup-uv proxy actions

  completed successfully:
  Test setup-buildx#1:Commit47c35f0pushedbyamannocci
  main

  Oct 22, 202615s
  More actions for workflow run 1