Fix outdated ruby version in Dockerfile #1722
Merged
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Summary
This is the Dockerfile changes I needed in #1721 to get the Dockerfile to build on the latest Docker for Mac (and likely other docker versions)
It seems the Dockerfile is still using ruby 2.6, when the project dropped 2.6 support 19 months ago in #1622
I've gone straight ahead to Ruby 3.3.4 (latest stable), despite Doorkeeper not yet officially supporting Ruby 3.3 (I'll open a separate PR to add that to the testing matrix).