When building an image (POST /build), swarm will extract filters from
buildargs. This is similar to how container creation (POST
/containers/create) extracts filters from environment variables.
Signed-off-by: Victor Costan <costan@gmail.com>
- Use start_with_busybox everywhere it's possible.
- Start only what we need.
- Improved correctness of a few tests at the same time.
Signed-off-by: Andrea Luzzardi <aluzzardi@gmail.com>