Update ruby unit test examples
What does this MR do and why?
The unit test example for ruby cannot be used by simply copy pasting the code. I added the ruby image and the installation steps for the packages before-script. This is in line with the discussion in this MR to expand the examples and allow for direct copy-pasting.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.