Directory named `mailslurper-config.json` created during c8 docker compose build

[upgradingdave]

When I start c8 environment using docker compose as described in the readme, I noticed a directory called mailslurper-config.json is created under my camunda-demo directory? It doesn't seem to be hurting anything, but we should probably track down where this directory is getting created from.

[plungu]

Mail slurper auto generates this file if it doesn't exist. Can point to the existing file in docker-compose.smtp.yaml so it does not generate.