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

[Tom Hughes]

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

Until a few months ago production was running with the system ruby, which for Debian 12 was 3.1 which was becoming increasingly problematic as it was approaching EOL and gems were dropping support for it.

So we switched to using https://github.com/fullstaq-ruby/server-edition and once we did that there was little reason not to use the latest version.

While the openstreetmap.org deployment is our primary use case and tends to take priority over other things we try not to deliberately break third party usage unnecessarily so we still test on 3.2 and 3.3 as well for now though I suspect we may have to drop 3.2 in the not too distant future.

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