build: dockerfile release notes

[crazy-max]

closes #15110

Proposed changes

While waiting for #15110 (comment), let's add the Dockerfile release notes that is currently missing in the Build section. Also moves frontend syntax to a dedicated Dockerfile section:

Related issues (optional)

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[dvdksn]

how about changing /build/dockerfile/frontend.md to /build/dockerfile/index.md ?

[crazy-max]

how about changing /build/dockerfile/frontend.md to /build/dockerfile/index.md ?

I'm not sure. While moving the frontend page I was thinking if this was legit to make it the entry page of this section.

Maybe instead we could have a new index.md (Overview) page with a short intro about the Dockerfile and cross linking to reference for full ref?

We could also probably rework and move https://docs.docker.com/develop/develop-images/dockerfile_best-practices/ in this section?

WDYT?

[dvdksn]

I completely lost this (blaming parental leave)

I think we should merge this and yes, we need to check the best practices page, I think moving some of that to this section will be clearer. Let's do it in a followup

Looks like this needs a rebase.

[crazy-max]

@dvdksn Should be good

[dvdksn]