ref(builder): remove volume definition in Dockerfile

This was missed in #1917.
docs(deisctl): clarify deisctl version when using install.sh
Merge pull request #1991 from carmstrong/clarify_deisctl_link

docs(deisctl): clarify deisctl version when using install.sh
Merge pull request #1984 from carmstrong/remove_builder_volume

ref(builder): remove volume definition in Dockerfile
fix(builder): restore VOLUME instruction so builder does not stack overlay filesystems

fix(builder): add comment explaining dockerfile volume change
Merge pull request #1996 from gabrtv/fix-builder-volume

fix(builder): restore VOLUME instruction so builder does not stack overlay filesystems
ref(tests): update details in CI node setup script