Remote Database support

[hairmare]

This docker setup uses a tcp tunnel to access the database remotely as documented here:

docker-multicontainer-libretime/Dockerfile

Lines 34 to 35 in 4a7d99b

	# There seems to be a bug somewhere in the code and it's not respecting the DB being on another host (even though it's configured in the config files!)
	# We'll use a lightweight golang TCP proxy to proxy any PGSQL request to the postgres docker container on TCP:5432.

Using a remote database is possible with LibreTime nowadays. I run my production setup in a bunch of VMs that connect to a remote DB cluster. In fact this was one of the early fixes I did to the LibreTime code-base.