help to understand experiment different mount types
dkr --rm sample-docker-vol-mount:1.0
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a. 1st time AUTO populate volume w/ buildtime layer /c1
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b. 2nd time named volume already exists, no AUTO populate. Volume content are shared
dkr --rm -it -v myc1:/c1 --name named-vol-1sttime sample-docker-vol-mount:1.0 sh
dkr --rm -it -v myc1:/c1 --name named-vol-2ndtime sample-docker-vol-mount:1.0 sh