Revert "Put the /stellar-core volume back in"
Revert "Put the /stellar-core volume back in"

This reverts commit e2c43d3516389cca7c424a546edf4eb099a05a9c.

Processing the core traces actually uses the bin that's now in the image plus /cores which is already a volume from the base.

stellar/docker-stellar-core,nullstyle/docker-stellar-core,stellar/docker-stellar-core,nullstyle/docker-stellar-core