  FAIL --push, tag present -> refuses: exit 0, want 1
  FAIL --push, tag absent -> proceeds: no 'is not present in the registry'
  FAIL --multiarch, tag present -> refuses: exit 0, want 1
  FAIL --push, registry unreachable -> refuses: exit 0, want 1
  FAIL --push, auth failure -> refuses: exit 0, want 1
5 of 6 cases FAILED
