Docker in docker rootless is flakey

[phlax]

This image doesnt seem to be well maintained.

The 19 version apparently doesnt work at all and they dont seem to have any CI to indicate this.

The 20 version afaict uses vfs which is very sub-optimal to say the least

[phlax]

im wondering whether to remove the running in docker section from the docs for now as using it seems to be sub-optimal to point of unusable