Revert "unarchive as isucon user"
Revert "unarchive as isucon user"

This reverts commit c44bb4e3f9c948b1ee92eff0b9de92aff10e747e.

isucon/isucon6-final,matsuu/isucon6-final,matsuu/isucon6-final,matsuu/isucon6-final,isucon/isucon6-final,matsuu/isucon6-final,isucon/isucon6-final,matsuu/isucon6-final,matsuu/isucon6-final,isucon/isucon6-final,matsuu/isucon6-final,matsuu/isucon6-final,isucon/isucon6-final,isucon/isucon6-final,isucon/isucon6-final,isucon/isucon6-final