As default, ivy home is $HOME/.ivy2
How about this?
1. Change ivy home directory from guest machine to host machine.
2. Mount to the host directory when docker run with `-v /path/to/host/ivy:/path/to/guest/ivy`
3. pio build --clean --sbt-extra "-Dsbt.ivy.home=/path/to/guest/ivy"
Even If you stop docker, the cache directory in host machine is still alive.
and then you can reuse the ivy directory later.
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Seongduk