Rebuild docker images for each release

[tstromberg]

Fixes #6146

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[codecov-io]

Codecov Report

Merging #6235 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master   #6235   +/-   ##
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  Coverage    38.5%   38.5%           
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  Files         122     122           
  Lines        8145    8145           
======================================
  Hits         3136    3136           
  Misses       4600    4600           
  Partials      409     409

[afbjorklund]

The problem here seems to have been that it rebuilds the docker images for minikube versions ?

And not just when the versions (or contents) of the images change. So it might replace the existing...

GVISOR_IMAGE_VERSION ?= 2

STORAGE_PROVISIONER_TAG := v1.8.1