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

[Nicholas La Roux]

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

> 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.

TIL this is a thing. Neat! :+1: 

Am I understanding correctly that production is running Ruby 3.4.5 but development for which Docker is encouraged is using Ruby 3.2 re: below?

https://github.com/openstreetmap/openstreetmap-website/blob/d85d1309c1ed1f14b5ee300ef0b182c725940d35/Dockerfile#L1

I understand supporting non-EOL Rubies (3.2, 3.3, 3.4) but should this be bumped to [3.4-bookerworm](https://hub.docker.com/layers/library/ruby/3.4-bookworm/images/sha256-1390a133776f76f63d3e99d9c45b5f3353b1af41044024ff8098a5cd993c97cb)? That would actually better accomplish what this PR was trying to do since it synchronizes development and production Ruby versions.

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