docker build - change buster to bionic

[alonre24]

• need to see if there are more places that need to be changed

[codecov]

Codecov Report

Merging #707 (cc58659) into master (a874faf) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #707   +/-   ##
=======================================
  Coverage   78.90%   78.90%           
=======================================
  Files          43       43           
  Lines        6850     6850           
=======================================
  Hits         5405     5405           
  Misses       1445     1445           

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[chayim]

Also edit opt/build/docker/Makefile (see line 7). You're going to also want to edit Dockerfile.gpu at the root of the repo.

It's best to make these consistent - even if there's variable use.

[alonre24]

Rafi updates the redisfab image instead - closed.