improve docker build with if-you-need-to-delete-this-open-an-issue-async-disk-cache

[btai24]

I have a docker image that takes 13 minutes to run ember build (fairly large ember project). Running on the host machine will also take 13 minutes initially, but drops down to a more manageable 1 minute build time after initial build (using the cache stored in /tmp/{user}/if-you-need-to-delete-this-open-an-issue-async-disk-cache i pressume). I tried copying in the cache into my docker build prior to running the ember build, but it doesn't seem like it uses the cache (continues to take ~13 minutes). Any ideas on whether the cache is tied to something built in my local repository or improving my docker build time in general?