[BUG][JAVA] java.lang.ClassCastException in ruby generator

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
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Description

I'm trying to generate a ruby api client using the ruby generator but it has started throwing an exception. This is being thrown from a GitHub workflow step that runs npx @openapitools/openapi-generator-cli generate -g ruby -c openapi-generator-config.yaml -o . and that runs via the openapi-generators/openapitools-generator-action@v1 action.

Exception in thread "main" java.lang.ClassCastException: class java.lang.Integer cannot be cast to class java.lang.String (java.lang.Integer and java.lang.String are in module java.base of loader 'bootstrap')
	at org.openapitools.codegen.languages.RubyClientCodegen.processOpts(RubyClientCodegen.java:208)
	at org.openapitools.codegen.DefaultGenerator.configureGeneratorProperties(DefaultGenerator.java:255)
	at org.openapitools.codegen.DefaultGenerator.generate(DefaultGenerator.java:945)
	at org.openapitools.codegen.cmd.Generate.execute(Generate.java:487)
	at org.openapitools.codegen.cmd.OpenApiGeneratorCommand.run(OpenApiGeneratorCommand.java:32)
	at org.openapitools.codegen.OpenAPIGenerator.main(OpenAPIGenerator.java:66)
Error: Process completed with exit code 1.

openapi-generator version

6.6.0

OpenAPI declaration file content or url

name: publish ruby api client docs
on: workflow_dispatch
jobs:
  api-client-ruby:
    runs-on: ubuntu-latest
    defaults:
      run:
        working-directory: api_client_ruby
    steps:
      - uses: actions/checkout@v3
      - uses: ruby/setup-ruby@v1
        with:
          ruby-version: 3.0.2
      - name: Get Spec
        id: get_spec
        run: |
          NEXT_VERSION=$(API=$API ruby getspec.rb)
          echo $NEXT_VERSION
          echo gemVersion: $NEXT_VERSION >> openapi-generator-config.yaml
          echo "next_version=$NEXT_VERSION" >> $GITHUB_OUTPUT
        env:
          API:  https://api.songtradr.com/v3/api-docs
      - name: Generate Client
        uses: openapi-generators/openapitools-generator-action@v1
        with:
          generator: ruby
          config-file: api_client_ruby/openapi-generator-config.yaml
          openapi-url: $API
          command-args: -o api_client_ruby
        env:
          API: https://api.songtradr.com/v3/api-docs

Generation Details

library: faraday
moduleName: SongtradrApiClientRuby
gemHomepage: https://songtradr.com
gemAuthor: songtradr
gemAuthorEmail: daryl.findlay@songtradr.com
gemSummary: Basic client for Songtradr API, generated with openapi-generator
gemLicense: MIT
inputSpec: https://api.songtradr.com/v3/api-docs
# gemVersion: this is appended during workflow

Steps to reproduce

Steps are in the workflow yaml.

Related issues/PRs

Suggest a fix

Start in RubyClientCodegen.processOpts at RubyClientCodegen.java:208 and reproduce the failure using the supplied workflow configuration, API URL, and ruby generator command. Check how the values in openapi-generator-config.yaml are read, then verify generation completes without the ClassCastException and add or run a regression test if the repository provides one for Ruby generator options.