build: Install fonts from xml2rfc-fonts

[kesara]

Fixes #6294

[rjsparks]

@kesara @jennifer-richards : checking as seems to have fallen into the meeting cracks - is this still the right thing to do, or did it get superseded with changing the dependency to xml2rfc[pdf]>=3.23.0?

[kesara]

@kesara @jennifer-richards : checking as seems to have fallen into the meeting cracks - is this still the right thing to do, or did it get superseded with changing the dependency to xml2rfc[pdf]>=3.23.0?

This PR is still valid. xml2rfc[pdf] extra does not install fonts.

[jennifer-richards]

This updates the dockerfile used to create the app container in a dev environment, but won't affect the containers we deploy to production. That's set up in dev/build. I think the intention is to get these fonts to production?

[kesara]

This updates the dockerfile used to create the app container in a dev environment, but won't affect the containers we deploy to production. That's set up in dev/build. I think the intention is to get these fonts to production?

So the correct Dockerfile to use is docker/base.Dockerfile?

[jennifer-richards]

So the correct Dockerfile to use is docker/base.Dockerfile?

Yes, everything is built on top of that I believe.

[rjsparks]

Requesting changes before merging to touch the files that would affect production

[kesara]

I have made requested changes with 09bb24e