changelog/v0.9.13.md
Added the ability to control the upload context to the Pulumi Service. You may now set a context property in Pulumi.yaml, which is combined with the location of Pulumi.yaml. This new path is the root of what is uploaded and can be used during deployment. This allows you to, for example, share common code that is located in a folder in your source tree above the directory Pulumi.yaml for the project you are deploying.
Added additional configuration for docker builds for a container. The build property of a container may now either be a string (which is treated as a path to the folder to do a docker build in) or an object with properties context, dockerfile and args, which are passed to docker build. If unset, context defaults to the current working directory, dockerfile defaults to Dockerfile and args default to no arguments.