docs: Docker build and Hub publish guide

[jescalada]

Adds documentation for the Docker build and publish process based on what we achieved with GitProxy.

It'd be great to spread awareness of this process to other FINOS projects that don't yet publish to Docker Hub. Publishing to Docker Hub has helped GitProxy gain adoption - G-Research is now able to deploy the project to production. It's a big opportunity to gain adoption on other FINOS projects, especially those lacking visibility.

Feel free to improve the wording or correct any inaccuracies in the document!

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[maoo]

Just amazing, thanks @jescalada for the contribution!

May I ask you to also add docker as an item under https://github.com/finos/community/blob/main/website/sidebars.js#L79 , so that we can show the page in the navigation bar?

I've reviewed the content and LGTM; we may decide in the future to improve contents, but this is definitely a great starting point.

[jescalada]

Whoops, totally forgot about that! Should be fixed now - this is a screenshot from building the site locally:

[TheJuanAndOnly99]

Thanks @jescalada for your amazing contribution! We'll try to make some noise around it and give you credit :)

[jescalada]

@TheJuanAndOnly99 Thank you! 🚀 I have some extra typo and wording fixes for the docs as well - stay tuned for that PR 🙂