Add docker in docker example to advanced usage in docs

[plafue]

No description provided.

[pat-s]

Thanks! I have been thinking about adding this in the past as well, so surely good to have. And the place matches as well.

I would say that there should be an additional note at the top which states something like "use the buildx plugins by default, this is only a fallback for advanced/custom use of docker build".

In regards to that (and this might answer the second question): what has motivated you to go this route instead of using the buildx plugin? (this would be a good use case example to add as well).

[woodpecker-bot]

Deployment of preview was torn down

[plafue]

@pat-s i rewrote the section quite a bit, guiding the reader through the changes and a bit of reasoning behind them. Became a bit wordy. i hope it's ok. Otherwise, feel free to make changes at your own discretion.

[pat-s]

Thanks, I'll check again later and apply suggestions as needed then 👍

[plafue]

Thanks for the support, @pat-s !