I can't help with documentation about deploying it on OSS Cloudfoundry, but you might be able to get some hints about which environment variables you need to set in your manifest by looking at the tile.yml (at least that's how I interpret it):

The name of the form defines the necessary environment variable. So the upper reference would result in a variable named "GSB_BROKERPAK_SOURCES".

The properties section for that form defines what kind of JSON key-value pairs you need to provide through that environment variable.

An example would be:

GSB_BROKERPAK_SOURCES: {"uri": "gs://foo/bar.brokerpak?checksum=md5:3063a2c62e82ef8614eee6745a7b6b59", "service_prefix": "experimental-", "config": "{}", "notes": "An example for configuring brokerpaks"}

There are plenty of other forms that might help to configure the GCP service broker to your needs.

Nevertheless, I also think that there is some documentation missing. But since the brokerpak feature still is in development there hopefully is more to come :)

@dominikmueller thks! Il try this.