upload empty manifest.txt to `erigon2-v2` buckets. 

just to make linter on CI green: https://github.com/ledgerwatch/erigon/actions/runs/9739016385/job/26873507862#step:7:92

and then enable CI for `erigon2-v2` it https://github.com/ledgerwatch/erigon/pull/11142