Deployment in batch

Yesterday I tried to deploy ~30 package at the same time and the new mechanism of deployment failed. Basically the issue was racing condition.

There was 4 runners (at most) trying to write the pypi credentials (.pypirc) at the same time.

@andre.anjos; can we create another runner inside of conda-linux with only one CPU for deployment? With that, we create a natural bottleneck for this stage.