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

[Grant]

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

Just as a note, [fullstaq-ruby/server-edition](https://github.com/fullstaq-ruby/server-edition) is not yet available for ARM64. I am slowly behind the scenes working on a PR to add ARM64 support there.

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