Free up some disk space on the runner before doing a release

[nineinchnick]

Another attempt (after #174) to make more space for building all images during the release. This should free up more than 10GB.

Reference: actions/runner-images#2840 (comment)

[nineinchnick]

We'll be able to remove some of the images soon, but we need to do a release with the new hdp3.1-hive-kerberized-2 image first.

[nineinchnick]

My other idea is to untag some of the intermediate images (otherwise unused) before calling docker system prune, that would be the last resort.

[hashhar]

what sequence do we follow?

do we:

build all
push all

or can we do:

for image in images:
build image
push image
prune
done

[nineinchnick]

We build all and then push all. This at least allows avoiding partial releases, where some images would fail to build. I'm not sure pruning is even enough. If we'll be able to remove some images soon, I don't really want to change how we do releases.

[hashhar]

seems to have worked. Thanks @wendigo for kicking the release and thanks @nineinchnick for this fix.