[openstreetmap/openstreetmap-website] Add and unignore `.ruby-version` file to ensure consistent dev Ruby (PR #6333)

[Pablo Brasero]

pablobm left a comment (openstreetmap/openstreetmap-website#6333)

The Dockerfile currently pulls `ruby:3.2-bookworm`, and `INSTALL.md` lists "Ruby 3.2+". If a version is chosen, it should be consistent across all instances.

I'm generally in favour of standardising on one version. Subtle changes to Ruby can cause different behaviours across different setups, same as with versions of gems. I don't think it necessarily has to be the latest available (3.4.5 in this case), but instead I'd lean towards whatever is used on production, precisely for the sake of consistency.

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