Fails on Windows Toolbox due to win paths of the secrets

Steps:

• Windows 7
• Docker version 18.03.0-ce, build 0520e24302
• stack-docker - git log --pretty=format:'%h' -n 1 >> 2fb3633
• docker-compose -f setup.yml up - OK
• docker-compose up -d - FAIL

>docker-compose up -d
Creating elasticsearch ... error

ERROR: for elasticsearch  Cannot create container for service elasticsearch: invalid mount config for type "bind": invalid mount path: 'C:/Users/{OBFUSCATED}/stack-docker/config/ssl/ca/ca.crt' mount path must be absolute

That seems to be a known docker issue.