Doesn't use sudo for docker/docker-compose calls

[jaromero]

All the invocations of docker and docker-compose are done without checking UID or without delegating to sudo. This means that, in order to use this tool as a normal user, one has to add their own user to the docker group. But doing so is a security risk:

• 'docker' group is root equivalent and bypasses policy, audit
• Docker Security

Running the entire thing under sudo is also not an option at the moment, since it creates files that will end up being only writable by root.