Container build context is the entire monorepo, by default

[mattfysh]

I'm not 100% sure but I believe the entire context directory is sent to the daemon during a container build (minus any files specified in the dockerignore file).

Currently the default context is the monorepo root, and then COPY statements scope out what to add to the container e.g. COPY dist/apps/my-new-app .

This seems like it would have poor performance if the entire monorepo is copied into the daemon before build. Would it be better to set the context to the dist/apps/my-new-app folder?