v2.0.0-rc.3

Features:

• Compose v2 is now hosted on github.com/docker/compose

Bugfixes:

• fix go panic on downscale using compose up --scale
• fix race condition in compose run --rm capturing exit code
• fix support for volumes_from in compose run
• multiple fixes regarding variables in compose.yaml and environment variables
• only build services set by compose build SERVICE...
• consider volumes_from when computing dependent services