Add workaround for building docker on debian 8 (#47106)
Add workaround for building docker on debian 8 (#47106)

Looks like there's a workaround with aufs used in debian 8.
Adding `tsflags=nodocs` works around this issue and results in smaller
image files also.

Closes #47097 and elastic/infra#14780

strapdata/elassandra,vroyer/elassandra,strapdata/elassandra,vroyer/elassandra,strapdata/elassandra,vroyer/elassandra,strapdata/elassandra,strapdata/elassandra