Yarn workspaces prevents lock file from being included with app Dockerfile

[mglaman]

The Dockerfile.app builds without a lock file because it's in the root directory for all workspaces. It probably needs to be copied in from outside the context, and that might not be possible.

Step 12/18 : RUN yarn
 ---> Running in aeafa286b76f
yarn install v1.22.19
info No lockfile found.
[1/4] Resolving packages..

[mglaman]

Found yarnpkg/yarn#5428 (comment)

Maybe https://yarn.build/

Needs Yarn v2