openapi-generator: [BUG] [Ruby] client escapes all path parameters

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• What’s the version of OpenAPI Generator used?
• Have you search for related issues/PRs?
• What’s the actual output vs expected output?
• [Optional] Bounty to sponsor the fix (example)

Description

Our application’s OpenAPI schema contains path parameters that contains ‘/’. The latest generated Ruby client stopped working for all the operations that contain a path parameter with ‘/’ in it. This is a regression for our use case of openapi-generator.

openapi-generator version

I am using the latest openapi-generator-cli docker image. This is a regression since v4.0.0 tag.

OpenAPI declaration file content or url

https://docs.pulpproject.org/en/3.0/nightly/api.json

Command line used for generation

docker run -u $(id -u) --rm -v ${PWD}:/local openapitools/openapi-generator-cli generate \
    -i /local/api.json \
    -g ruby \
    -o /local/$1-client \
    -DgemName=$1_client \
    -DgemLicense="GPLv2" \
    -DgemVersion=0.1.0rc2 \
    --skip-validate-spec \
    --strict-spec=false

Steps to reproduce

Related issues/PRs

https://github.com/OpenAPITools/openapi-generator/pull/3039

Suggest a fix

@ccouzens, could you make the path parameter escaping optional?